filelog: rename filelog.size() to filelog.len()
filelog.size() is misleading for users of revlog.size() since
it doesn't return the size of the revision.
adding foo
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
pushing to ../2
searching for changes
adding changesets
adding manifests
adding file changes
added 1 changesets with 1 changes to 1 files