vchoi_fork

[svn-r7917] Purpose:
    Code cleanup

Description:
    Clean up compiler warnings, especially the 'FUNC' variable not used which
comes out in production mode.

Solution:
    Had to add a new FUNC_ENTER_NOAPI_NOINIT_NOFUNC macro for those non-API
functions which don't need the 'FUNC' variable defined.  (This will be _so_
much easier when C99 is standard on all our supposed platforms, since it has a
__FUNC__ macro... )

Platforms tested:
    FreeBSD 4.9 (sleipnir)
    too minor for h5committest (although there were lots of files changed, the
        change was minor in each one)