[PLUGIN] bzr changeset now support rollup changesets (and bzr send-changeset)

[John A Meinel]

Just off of the discussions that have been bantered around bzr changeset
now supports rolling up multiple changesets.
Right now it only works on revisions that are in your revision-history.
The syntax is:

bzr changeset -r <base>:<target>
With <base> defaulting to the parents[0] of target, and target
defaulting to the last commit.

so if your last commit was number 10, all of these are equivalent
    bzr cset
    bzr cset -r 10
    bzr cset -r :10
    bzr cset -r 9:10

But you can specify a different base if you want to. You can even print
the changeset for the entire tree with:
    bzr cset -r 0:
(warning do not do this on the 800+ bzr mainline :)

I have not updated read_changeset.py yet, so bzr verify-changeset and
bzr apply-changeset will not work.

This is more just a test to get some feedback about the changeset
format. Whether people like it or not.

Just as a sample, I am including a sample changeset as an attachment.

This is just a rollup changeset of revisions 796 and 797 of the bzr
mainline developement. I rolled them up because they were both small,
not because they logically go together.

There is also the command 'bzr send-changeset <to>' which will create a
changeset, and email it. Thanks to Johan Rydberg.
It utilizes a file called '.bzr/x-send-address' which is meant to be the
default location to send changesets. And should probably be something
that bzr branch pulls across.

It also creates a new entry ~/.bzr.conf/smtp-host to define the mailhost
to use for sending an email (for people on windows who don't have a
local sendmail running).

John
=:->

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