I considered not checking them in, or making the checkin configurable.
However, then they would remain not checked in if edited by a user, which is
probably not desired.
Note that passing undef as the username/ip to rcs_commit_staged may not
result in ideal behavior; the commit may seem to come from "anonymous" with
some revision control systems. Most of them handle it a bit better and just
have it come from whatever user is running the build.
