Help with plumbing a new WorkingTreeFormat in

[Ian Clatworthy]

Rob,

I've coded up a new WorkingTreeFormat that supports filtered views
and now I need some direction on how to expose it and the upgrade
logic. I've added some upgrade code to bzrdir.py to upgrade from
WTF4 to WTF5 but I'm a bit lost after that. :-(

In particular, can the format just "float" there without
being the default? If so, how do I specify to upgrade to it?
The upgrade command doesn't seem to support upgrading it directly.
Do I need to create a new set of combinations of tree+branch_repo?
Is there some code I can start from for writing the upgrade tests?

My latest code is here: sftp://ianc@people.ubuntu.com/home/ianc/public_html/bzr/bzr.views/.
It's a loom and the format support is all in the layer above bzr.dev.

Chat soon about this say? Phone is good but IRC might work better
if others are interested in learning as well.

Ian C.