purge: simplify safety net for case mangling filesystems
Relying on the exact return of statwalk would cause us to abort
when there was at least one tracked file inside an ignored directory.
This patch forces an extra walk of the whole working directory even
on sane filesystems, where it wouldn't be needed.
Fixes issue621.
Basic install:
$ make # see install targets
$ make install # do a system-wide install
$ hg debuginstall # sanity-check setup
$ hg # see help
See http://www.selenic.com/mercurial/ for detailed installation
instructions, platform-specific notes, and Mercurial user information.