Note: the added '?' to the regexps (which make this non-greedy) are
important! Without them, it'll think that the line numbers are part of
the file name. (The test would still pass because it will still format
it the same way.)
Fixes#2554.
also fixes a bunch of other stuff like:
- parseStack markTop works again (so you get the right line numbers in
self-test)
- you can (with appropriate env var) run apps with NO PACKAGES at
all (even ctl)
- more consistently refer to METEOR-CORE@ releases as "Meteor 1.2.3"
