[PATCH 0 of 1] Refactor var names in filecommit to improve readability.

[Martijn Pieters]

While tracing a hgsubversion problem, I tried to wrap my head around what
localrepo.localrepository.filecommit does.

I ended up refactoring the variable names, as too many 2-character variable
names make my head hurt. :-) Hereby the result in the hope that it's useful to
other devs as well.

--
Martijn Pieters