Clean up warnings, switch library code to use Standard C/POSIX wrapper
macros, remove internal calls to API routines, update checkapi and checkposix
scripts.
Tested on:
Mac OSX/64 10.8.3 (amazon) w/C++ & FORTRAN
Big-Endian Linux/64 (ostrich)
Description:
Added internal tesitng routines to traverse a file and verify that symbol table
information is *always* cached, whenever possible. Added this check to the end
of many tests to check all the test files, right before the call to h5_cleanup.
Tested: jam, amani, heiwa (h5committest)
1) Move the test for H5D_EXT_PREFIX in links.c to a separate file: links_env.c
2) links_env.c will be used by testlinks_env.sh to test for the environmental
variable H5D_EXT_PREFIX in searching for the external linked file.
