Peg revisions are now parsed separately. If a revision is supplied but not a
peg revision, we used the former as peg revision, as subversion seems to do.
To synchronize definitions in working copy .hgexternals with remote svn
repository:
$ hg svn updateexternals
To synchronize them with .hgexternals at revision REV:
$ hg svn updateexternals REV
Last synchronized externals referenced are stored in .hg/svn/externals (a dump
of the synchronized .hgexternals).
This change means that files located in the actual branches directory will now be wholly
ignored. If we want to handle those correctly, it will take a reasonably large amount of work
and probably a configuration flag. Also, any non-related paths outside of branches/trunk will
be explicitly ignored, which is similar to the somewhat accidental pre-branch-refactor
behavior. Finally, any unrelated files located as children of branches will cause the directory
in branches to be used as the branch - not, as recently was the case, the directory immediately
containing that file.
