checkout-index: work from subdirectory.
checkout-index: work from subdirectory.

With this, git-checkout-index from a subdirectory works as
expected.  Note that "git-checkout-index -a" checks out files
only in the current directory and under.

Signed-off-by: Junio C Hamano <dc50d1021234060e53ec42a77d526afa2fe07479@cox.net>

destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git