Add locate command.
# HG changeset patch
# User Bryan O'Sullivan <bos@serpentine.com>
# Node ID ebf5eba347a17a5c09000b3342caf350cd060a1b
# Parent d2994b5298fb20f87dc1d4747635b280db3c0526
Add locate command.
Used for finding files with names that match specific patterns,
such as "*.c".
This patch also introduces localrepository.getcwd, which returns the
current directory relative to the repository root.