[MERGE][bug 115343] Allow 'bzr branch -r revid:xxx' to branch any revision in ancestry

[John Arbash Meinel]

Branch5 supported branching any revision in your repository (it if it 
wasn't in revision-history, it just called gen_history() to create it 
from scratch).

The attached patch makes "BzrBranch6" also support it. I only test that 
you can branch anything in Ancestry (not just in your repository) since 
that seemed more realistic for foreign branches. (And if we ever 
implement any sort of auto-gc).

This also splits out the Branch.sprout() tests into their own module.

It also adds a test that Branch.sprout() produces a target branch of the 
same format. Modulo a workaround for RemoteBranch objects.

John
=:->
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