Use pathto to display nonexisting files

kwexpand/kwshrink: warn about nonexisting files

_overwrite method for kwrepo.commit, kwexpand, kwshrink File selection (kwexpand/kwshrink) in _kwfwrite method.

Sort files before overwriting

_iskwfile checking method for kwrepo.commit, kwexpand/kwshrink

Walk manifest in kwexpand/kwshrink

For overwriting commands use node and manifest to speed up walk

kwfiles: change option "ignored" to "ignore", add option "untracked" "ignore" like corresponding config value. "untracked" allows quick check if a new file that has not been added yet would be target for expansion. Update help accordingly.

File collections specific to kwexpand/kwshrink vs kwfiles commands

Flag kwfiles if verbose; shorten bailout code

Tighten condition for kwshrink/kwexpand test

Underscore prefixes only for names at top level, or compatibility wrappers

Count keywords in a customized kwfilelog read method

walkopts for kwexpand, kwshrink, kwfiles commands kwfiles optionally shows ignored files or all flagged Use pathto method to print kw filenames if possible. Commands abort with meaningful error _weedcandidates renamed to _weedfiles, and only for commands. For kwrepo.commit we could get modified + added from kwrepo.status(match=ui.kwfmatcher) -- but this would mean to read manifest before commit, and again after for expansion.