[MERGE] loosen the constraints on WorkingTree.set_last_revision.

[Robert Collins]

WorkingTree.set_last_revision currently requires the revision be in the
branch's history. However, using uncommit one can easily have a tree
whose branch does not contain the tree's last revision - it makes sense
to me to allow constructing that scenario directly via the api.

This is useful to allow simplifying some of the corner cases in
baz-import, and for dirstate.

Seeking a +1.

Rob
-- 
GPG key available at: <http://www.robertcollins.net/keys.txt>.
-------------- next part --------------
A non-text attachment was scrubbed...
Name: set-last-revision-loose.patch
Type: text/x-patch
Size: 3111 bytes
Desc: not available
Url : https://lists.ubuntu.com/archives/bazaar/attachments/20060807/67680cea/attachment.bin 
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: application/pgp-signature
Size: 191 bytes
Desc: This is a digitally signed message part
Url : https://lists.ubuntu.com/archives/bazaar/attachments/20060807/67680cea/attachment.pgp