shelve: move possible shelve file extensions to a single place
This and a couple of following patches are a preparation to
implementing obsolescense-enabled shelve which was discussed
on a Sprint. If this refactoring is not done, shelve is going
to look even more hackish than now.
This particular commit introduces a slight behavior change. Previously,
if only .hg/shelve/name.patch file exists, but .hg/name.hg does not,
'hg shelve -d name' would fail saying "shelve not found". Now deletion
will only fail if .patch file does not exist (since .patch is used
as an indicator of an existing shelve). Other shelve files being absent
are skipped silently to accommodate for future introduction of obs-based
shelve, which will mean that for some shelves .hg and .patch files exist,
while for others .hg and .oshelve.
lib - sys sys
mercurial - sys sys
hgrc.d - sys sys
9diff.rc - sys sys
factotum.rc - sys sys
rc - sys sys
bin - sys sys
9diff - sys sys
hg - sys sys
sys - sys sys
lib - sys sys
python - sys sys
lib - sys sys
python2.5 - sys sys
site-packages - sys sys
hgext - sys sys
+ - sys sys
mercurial - sys sys
+ - sys sys
mercurial-VERSION-py2.5.egg-info - sys sys
src - sys sys
cmd - sys sys
hg - sys sys
+ - sys sys