hdf5_ep

[svn-r9420] Bug fix.

tconfig.c:
    Verified only the unsigned int types and did not detect inconsistencies
    on signed type such as int_fast16_t.
    Changed code to verify both signed and unsigned int types wherever
    applicable.  It also depends on signed and unsigned forms of an
    int type must be of the same sizes.

testhdf5.c:
    Shorten the configure test name to 'config'--easier to type.

Tested on LLNL Frost and Snow.  Will test in Copper after commit.