Bad tags kill eups distrib install

[ktlim]

A tag that contains certain regexp metacharacters, including "+", will cause failures to recognize the .list file from the server. The problem is in

eups/python/eups/distrib/server.py

Line 1354 in 3fcfb38

mat = re.search(r"^EUPS distribution %s version list. Version (\S+)\s*$" % self.tag, line)

which substitutes the tag name without any escaping before doing a regexp match.

[timj]

Looks like using re.escape(self.tag) would be enough. I wonder if there are other places that need that.