[MERGE] Add Branch.set_last_revision_info smart request

[Andrew Bennetts]

Hi all,

This change adds a Branch.set_last_revision_info verb to the smart protocol.  In
combination with Ian's proposed post_change_branch_tip hook
(https://lists.ubuntu.com/archives/bazaar/2008q2/040066.html) this will make it
possible to have server-side hooks when a branch's tip changes.

(James Henstridge's proposed set_last_revision_info hook would probably work as
well.)

This change depends on the “Better infrastructure for dealing with 'bad request'
responses from a smart server” patch I sent earlier today.

The tests are large relative to the actual new production code.  It can be
fiddly hitting all the error paths...

-Andrew.

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