hgweb: fix unbundle. After the WSGI changes, even if a push over HTTP succeeds, apache complains about "Premature end of script headers: hgwebdir.cgi" and returns a "HTTP Error 500: Internal Server Error", making the local hg abort. The change to either of the files touched by this patch is enough to fix this, but I think changing both is a more robust solution.

Fix push over https. Without this patch, python gives me a TypeError: write() argument 1 must be string or read-only buffer, not file

Allow http://user@example.com URLs (i.e. without passwords)

hg.py: move exception handling code to try to avoid hiding errors

help: add help to mq extension

help: make "hg help EXTENSION" work

Adjusted test output to changed abort message of 'hg merge' (from 0229ff95faec)

merge with crew.