r/a=LpSolit

Bug 680131: Replace the MPL 1.1 license by the MPL 2.0 one in all files, and add it to files which miss one
r=kiko r=mkanat r=mrbball a=LpSolit

to use constants instead of local variables. Also, change the permissions
so that they are stricter in general, and work better under suexec.
This also fixes the problem that dependency graphs didn't work under
suexec, and adds a "web" directory by default to Extensions created with
extension/create.pl.
r=mkanat, a=mkanat (module owner)

During the CVS imports into Bzr, there were some inconsistencies introduced
(mostly that files that were deleted in CVS weren't being deleted in Bzr).
So this checkin makes the bzr repo actually consistent with the CVS repo,
including fixing permissions of files.

Patch by Max Kanat-Alexander <mkanat@bugzilla.org> (module owner) a=mkanat