hdf5_ep

[svn-r24810] Description:
    Bring r24803 & r24804 from trunk to 1.8 branch:

r24804:
   Brought changes from Coverity branch back to trunk, and cleaned up misc.
   other warnings & formatting issues:

   r20833:
   Fixed Coverity 667 and 668 with real integer overflow tests this time.

   r20834:
   Use HDstrncpy and HDstrncat. --gh 

   r20835:
   Change to use strncpy - use base_len + 1 for line 156, use HDstrlen(path) + 1 for line 159

   r20836:
   Fixed coverity 585 by casting output of fgetc() to a char.

   r20837:
   Changed sprintf calls to snprintf with size 1 less than the allocated buffer to address coverity issue #967.

r24803:
  Rename GCC_DIAG_OFF/ON macros to H5_GCC_DIAG_OFF/ON and move from
  src/H5private.h to src/H5public.h.  Wrap typedef of hsize_t and hssize_t
  in DIAG_OFF(long-long) macros.

  Clean up a bunch of "macro '-' is unused" warnings.

Tested on:
    Mac OSX/64 10.9.2 (amazon) w/C++, FORTRAN & parallel
    (too minor to require h5committest)