util: better handle '-' in version string (issue5302)
versiontuple() was previously only splitting on '+' and strings
like "3.9-rc" were causing it to misreport the version as
(3, None). By splitting on either '+' or '-' we can handle
our version strings with "-rc" in them.
$ hg init
$ touch unknown
$ touch a
$ hg add a
$ hg ci -m "1"
$ touch b
$ hg add b
$ hg ci -m "2"
Should show unknown
$ hg status
? unknown
$ hg revert -r 0 --all
removing b
Should show unknown and b removed
$ hg status
R b
? unknown
Should show a and unknown
$ ls
a
unknown