Don't truncate tag and branch names after 30 chars (introduced 73860ffbe798)
with test added for a long (local) tag name.
to build a new macosx binary package:
install macpython from http://www.python.org/download/mac
install py2app from http://pythonmac.org/packages/
make sure /usr/local/bin is in your path
run bdist_mpkg in top-level hg directory
find packaged stuff in dist directory