Add new g_file_has_prefix that does the same as g_file_contains_file.

Add new g_file_has_prefix that does the same as g_file_contains_file.

2008-02-21  Alexander Larsson  <alexl@redhat.com>

        * gfile.[ch]:
        * gio.symbols:
	Add new g_file_has_prefix that does the same as g_file_contains_file.
	Deprecate g_file_contains_file and add a macro that converts
	it to g_file_has_prefix.
	The reason for this change is that the contains_file() name seems to
	imply that this does more work than what it does, but its really only
	a name match (from #517086)

        * gdummyfile.c:
        * glocalfile.c:
        * tests/g-file.c:
	Update to match the above change.

svn path=/trunk/; revision=6546