[MERGE] Copyright cleanup

[John Arbash Meinel]

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The attached patch cleans up all of the copyright and license statements
in the bzr source. It also adds tests to help us remember to add them
with the correct text.

We had the problem that lots of our files were "Copyright Canonical
Development Ltd" which is not a real company, and some other variations
on this theme. Also, some files were missing the GPL statements.

I want to be clear about the intent of this patch, since copyright can
be a little controversial.

1) The big motivation for this is not to shut out the community, but
just to clean up all of the invalid copyright statements.

2) It has been the general policy for bzr that we want a single
copyright holder for all of the core code. This is following the model
set by the FSF, which makes it easier to update the code to a new
license in case problems are encountered. (For example, if we want to
upgrade the project universally to GPL v3 it is much simpler if there is
a single copyright holder). It also makes it clearer if copyright is
ever debated, there is a single holder, which makes it easier to defend
in court, etc. (I think the FSF position is that if you assign them
copyright, they can defend it in court rather than you needing to, and
I'm sure Canonical would do the same).
As such, Canonical has requested copyright assignments from all of the
major contributers.

3) If someone wants to add code and not attribute it to Canonical, there
is a specific list of files that are excluded from this check. And the
test failure indicates where that is, and how to update it.

4) If anyone feels that I change a copyright statement incorrectly, just
let me know, and I'll be happy to correct it. Whenever you have large
mechanical changes like this, it is possible to make some mistakes.

Just to reiterate, this is a community project, and it is meant to stay
that way. Core bzr code is copyright Canonical for legal reasons, and
the tests are just there to help us maintain that.

John
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