Some changes do log.h and adding its documentation

docs/Examples/examples.html

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-                <ol class="chapter"><li class="expanded "><a href="../Introduction/introduction.html"><strong aria-hidden="true">1.</strong> Introduction</a></li><li><ol class="section"><li class="expanded "><a href="../Introduction/why_this_library.html"><strong aria-hidden="true">1.1.</strong> Why this library</a></li><li class="expanded "><a href="../Introduction/how_to_install.html"><strong aria-hidden="true">1.2.</strong> How to install</a></li><li class="expanded "><a href="../Introduction/library_structure.html"><strong aria-hidden="true">1.3.</strong> Library structure</a></li><li class="expanded "><a href="../Introduction/understanding_the_library.html"><strong aria-hidden="true">1.4.</strong> Understanding the library</a></li><li class="expanded "><a href="../Introduction/how_to_use_the_library.html"><strong aria-hidden="true">1.5.</strong> How to use the library</a></li></ol></li><li class="expanded "><a href="../Features/features.html"><strong aria-hidden="true">2.</strong> Features</a></li><li><ol class="section"><li class="expanded "><a href="../Features/two_way_iterators.html"><strong aria-hidden="true">2.1.</strong> Two way iterators</a></li><li class="expanded "><a href="../Features/custom_allocation.html"><strong aria-hidden="true">2.2.</strong> Custom allocation</a></li><li class="expanded "><a href="../Features/callbacks.html"><strong aria-hidden="true">2.3.</strong> Callbacks</a></li><li class="expanded "><a href="../Features/functions_table.html"><strong aria-hidden="true">2.4.</strong> Functions Table</a></li></ol></li><li class="expanded "><a href="../Overview/overview.html"><strong aria-hidden="true">3.</strong> Collections Overview</a></li><li class="expanded "><a href="../utl/index.html"><strong aria-hidden="true">4.</strong> utl</a></li><li><ol class="section"><li class="expanded "><a href="../utl/assert.h/index.html"><strong aria-hidden="true">4.1.</strong> assert.h</a></li><li><ol class="section"><li class="expanded "><a href="../utl/assert.h/overview.html"><strong aria-hidden="true">4.1.1.</strong> Overview</a></li><li class="expanded "><a href="../utl/assert.h/valued_assertions.html"><strong aria-hidden="true">4.1.2.</strong> Valued Assertions</a></li><li class="expanded "><a href="../utl/assert.h/generic_assertions.html"><strong aria-hidden="true">4.1.3.</strong> Generic Assertions</a></li></ol></li><li class="expanded "><a href="../utl/foreach.h/index.html"><strong aria-hidden="true">4.2.</strong> foreach.h</a></li><li class="expanded "><a href="../utl/log.h/index.html"><strong aria-hidden="true">4.3.</strong> log.h</a></li><li class="expanded "><a href="../utl/test.h/index.html"><strong aria-hidden="true">4.4.</strong> test.h</a></li><li class="expanded "><a href="../utl/timer.h/index.html"><strong aria-hidden="true">4.5.</strong> timer.h</a></li></ol></li><li class="expanded "><a href="../Examples/examples.html" class="active"><strong aria-hidden="true">5.</strong> Examples</a></li></ol>
+                <ol class="chapter"><li class="expanded "><a href="../Introduction/introduction.html"><strong aria-hidden="true">1.</strong> Introduction</a></li><li><ol class="section"><li class="expanded "><a href="../Introduction/why_this_library.html"><strong aria-hidden="true">1.1.</strong> Why this library</a></li><li class="expanded "><a href="../Introduction/how_to_install.html"><strong aria-hidden="true">1.2.</strong> How to install</a></li><li class="expanded "><a href="../Introduction/library_structure.html"><strong aria-hidden="true">1.3.</strong> Library structure</a></li><li class="expanded "><a href="../Introduction/understanding_the_library.html"><strong aria-hidden="true">1.4.</strong> Understanding the library</a></li><li class="expanded "><a href="../Introduction/how_to_use_the_library.html"><strong aria-hidden="true">1.5.</strong> How to use the library</a></li></ol></li><li class="expanded "><a href="../Features/features.html"><strong aria-hidden="true">2.</strong> Features</a></li><li><ol class="section"><li class="expanded "><a href="../Features/two_way_iterators.html"><strong aria-hidden="true">2.1.</strong> Two way iterators</a></li><li class="expanded "><a href="../Features/custom_allocation.html"><strong aria-hidden="true">2.2.</strong> Custom allocation</a></li><li class="expanded "><a href="../Features/callbacks.html"><strong aria-hidden="true">2.3.</strong> Callbacks</a></li><li class="expanded "><a href="../Features/functions_table.html"><strong aria-hidden="true">2.4.</strong> Functions Table</a></li></ol></li><li class="expanded "><a href="../Overview/overview.html"><strong aria-hidden="true">3.</strong> Collections Overview</a></li><li class="expanded "><a href="../utl/index.html"><strong aria-hidden="true">4.</strong> utl</a></li><li><ol class="section"><li class="expanded "><a href="../utl/assert.h/index.html"><strong aria-hidden="true">4.1.</strong> assert.h</a></li><li><ol class="section"><li class="expanded "><a href="../utl/assert.h/overview.html"><strong aria-hidden="true">4.1.1.</strong> Overview</a></li><li class="expanded "><a href="../utl/assert.h/valued_assertions.html"><strong aria-hidden="true">4.1.2.</strong> Valued Assertions</a></li><li class="expanded "><a href="../utl/assert.h/generic_assertions.html"><strong aria-hidden="true">4.1.3.</strong> Generic Assertions</a></li></ol></li><li class="expanded "><a href="../utl/foreach.h/index.html"><strong aria-hidden="true">4.2.</strong> foreach.h</a></li><li class="expanded "><a href="../utl/log.h/index.html"><strong aria-hidden="true">4.3.</strong> log.h</a></li><li><ol class="section"><li class="expanded "><a href="../utl/log.h/log_functions.html"><strong aria-hidden="true">4.3.1.</strong> Log Functions</a></li><li class="expanded "><a href="../utl/log.h/configuration.html"><strong aria-hidden="true">4.3.2.</strong> Configuration</a></li><li class="expanded "><a href="../utl/log.h/meanings.html"><strong aria-hidden="true">4.3.3.</strong> Meanings</a></li></ol></li><li class="expanded "><a href="../utl/test.h/index.html"><strong aria-hidden="true">4.4.</strong> test.h</a></li><li class="expanded "><a href="../utl/timer.h/index.html"><strong aria-hidden="true">4.5.</strong> timer.h</a></li></ol></li><li class="expanded "><a href="../Examples/examples.html" class="active"><strong aria-hidden="true">5.</strong> Examples</a></li></ol>
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