Sync develop changes April 3 - April 4 to hdf5_1_14_4 (#4324) #4325
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Remove VS ptable error from Known Problems (Remove VS ptable error from Known Problems #4317)
Simply check for datatypes with unusual number of unused bits (Simplify check for datatypes with unusual number of unused bits #4309)
Avoids potential undefined behavior in H5T_is_numeric_with_unusual_unused_bits
Converts an assertion in H5G_loc_find into a normal error check that checks for empty link names
Initializes H5O_link_t structure early in H5G__ent_to_link to avoid trying to free potentially uninitialized memory
Checks for an empty link name after H5MM_strndup in H5G__ent_to_link
Fixes GitHub #4307
Fixes an issue where invalid datatype IDs are passed to application conversion functions in the case where the top-level conversion function is a library-internal function that operates on a container-like datatype, but one or more of the base datatype members are converted with an application conversion function.
Run configure checks with and without CFLAGS/CMAKE_C_FLAGS since some compilers work in one case while not working in the other case
Sync CMake configure checks with Autotools