Fix issue240: mq: qpush fails on Solaris

merge with crew.

fix coding style of backout editor change.

Force editor to appear for an 'hg backout' if a message or logfile aren't supplied. Pre-fill the commit message with the changeset being backed out. Fixes bug 238.

hooks: add preupdate and update hooks. preupdate run before working dir updated. can prevent update. update run after working dir updated.

merge with crew.

localrepo.update: abort if outstanding merges, instead of warn/return 1

make reason for sys.argv change obvious in code.

merge with crew.

Check existance of sys.argv for the use from mod_python.

add tests for incoming and outgoing

fix a traceback when unbundling does not add any changesets only run the hooks when some changesets has been added

catch KeyboardInterrupt in run-tests

indent: fix alignment

fix errors spotted by pychecker (mostly scope problems)