addbackup: handle file in subdirectory
The current naming scheme ('journal.backups.<file>') resulted is bad directory
name when 'file' was in a subdirectory. We now extract the directory name and
create the backupfile within it.
We plan to use file in a subdirectory for cachefile.
$ hg init
$ echo a > a
$ hg add a
$ hg commit -m test
Do we ever miss a sub-second change?:
$ for i in 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20; do
> hg co -qC 0
> echo b > a
> hg st
> done
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