Given that many if not most Java IDEs don't make use of a file to keep
track of what classes are actually part of a project or workspace, and
instead simply include all the .java files in a given directory, how
do most folks manage revision control for projects?  That is, say I
need to rewind back to an older version of a project which didn't
include a particular .java file: indeed, it wouldn't compile under
that version.  How do I avoid having to manually delete files every
time I do this?  And how would I be able to get an idea of what files
were added to the project at what points?  The CVS-based revision
control systems I've looked at don't seem to support this very well.