Rename RBTREE & BPTREE _clean in _reset to avoid confusing _clean & _clear functions. See #97

tests/test-mbptree.c

@@ -187,7 +187,7 @@ static void test2(void)
   assert (k == -2);
   r = btree_pop_at(NULL, b, 0);
   assert (r == false);
-  btree_clean(b);
+  btree_reset(b);
   assert (btree_size(b) == 0);
   assert (btree_empty_p(b));
   btree_clear(b);

tests/test-mrbtree.c

@@ -266,7 +266,7 @@ static void test_uint(void)
 
   rbtree_uint_init (tree);
   assert(rbtree_uint_empty_p(tree));
-  rbtree_uint_clean(tree2);
+  rbtree_uint_reset(tree2);
   rbtree_uint_push(tree2, 17421);
   assert(rbtree_uint_size(tree2) == 1);
   rbtree_uint_swap(tree, tree2);