Make M*LIB stricter for INIT_MOVE operator:

* either the default INIT_MOVE operator works ('=')
* either an INIT_MOVE method is defined
* or it is disabled.
As a consequence, fix usage of testobj_t and mpz_t in the repository

The emulation layer of INIT_MOVE using INIT_SET+CLEAR is removed:
it wasn't working correctly with the local memory context
(INIT_MOVE doesn't need any local memory context to work,
 whereas INIT_SET/CLEAR does)
Remove macro M_DO_INIT_MOVE as it is now useless and uses M_CALL_INIT_MOVE.

The INIT_MOVE default method no longer sets the old 'src' to '0':
it was useless (it doesn't catch any error) and complicates compiler parsing.

Fix POD & A1 & CSTR & classic oplists definition (missing INIT_MOVE operators).

example/ex11-multi02.c

@@ -35,6 +35,7 @@ mpz_fast_hash(const mpz_t z)
 #define M_OPL_mpz_t()                                                   \
   (INIT(mpz_init), INIT_SET(mpz_init_set), SET(mpz_set), CLEAR(mpz_clear), \
    INIT_WITH(API_1(M_INIT_WITH_THROUGH_EMPLACE_TYPE)),                  \
+   INIT_MOVE(M_COPY_A1_DEFAULT)                                       \
    EQUAL( API( mpz_cmp, EQ(0), ARG1, ARG2)),                            \
    CMP(mpz_cmp),                                                        \
    HASH(mpz_fast_hash),                                                 \
@@ -77,7 +78,8 @@ mpfr_fast_hash (const mpfr_t f)
 /* Define the OPLIST of a mpfr_t and register it globally */
 #define M_OPL_mpfr_t()                                                   \
   (INIT(mpfr_init), INIT_SET(API(mpfr_init_set, VOID, ARG1, ARG2, MPFR_RNDN)), SET(API(mpfr_set, VOID, ARG1, ARG2, MPFR_RNDN)), CLEAR(mpfr_clear), \
-   INIT_WITH(API_1(M_INIT_WITH_THROUGH_EMPLACE_TYPE)),                  \
+   INIT_WITH(API_1(M_INIT_WITH_THROUGH_EMPLACE_TYPE)),                   \
+   INIT_MOVE(M_COPY_A1_DEFAULT)                                        \
    EQUAL( API( mpfr_cmp, EQ(0), ARG1, ARG2)),                            \
    CMP(mpfr_cmp),                                                        \
    HASH(mpfr_fast_hash),                                                 \