test-status.t: test ui.slash on Windows

manifest: remove redundant sorted() call for --all repo.store.datafiles() is now already sorted (for all types of stores). A follow-up to 4cbb1137941d.

Merge from crew-stable

store: only one kind of OSError means "nonexistent entry"

store: sort the results of fncachestore.datafiles()

Merge with stable

fileset: fix generator vs list bug in fast path $ hg debugfileset 'a or b' would only return a or b but not both because the base file list was a generator instead of a replayable sequence.

debugfileset: implement --rev, more tests

test-fileset: test remaining predicates - exec - symlink - size - resolved / unresolved - subrepo

fileset: do not traceback on invalid grep pattern