hdf5_ep

[svn-r17401] Description:
	Bring r17400 from trunk to 1.8 branch:

	Refactor H5F_flush into two routines, one which handles the recursion/
iteration necessary to handle mounted files; and one which just handles the
flush operation for a single file.

	Also, remove H5F_FLUSH_INVALIDATE and switch all code to depend on
H5F_FLUSH_CLOSING.

Tested on:
	FreeBSD/32 6.3 (duty) in debug mode
	(h5committested on trunk)