email-send with server side plugin available

[Viktor Nagy]

Hi!

Yesterday, I've extended the code of the bzr-email plugin to use the
post_change_branch_tip hook introduced in 1.6. This way there is no
need to have a plugin installed on every client as the smart server
can run plugins as well. [1]

Still there are some differences wrt the original bzr-email. First of
all, the if you use this plugin on your desktop client/server then you
will receive two messages on commit. One from the original bzr-email
post_commit hook and one from the new post_change_branch_tip hook.
Second, the tip changes for uncommit, push, pull, (etc?) as well, not
only for a commit. Right now the plugin doesn't make a difference and
sends the email at every change.

I've proposed the code for merging, but while it gets reviewed you can
access it at
https://code.launchpad.net/~viktor-nagy/bzr-email/tip-hook

[1]: https://bugs.launchpad.net/bzr/+bug/211967/comments/4

The main part of the message is finished, but as this is my first
(hopefully) meaningful email I will try to introduce myself quickly.

I am a PhD student in economics and a hobby programmer (amazed by the
simplicity of django and the complexity of bzr) who is trying to build
a tool to help scientific collaboration. I got to know Bazaar in
search for the most suitable version control system for my idea, and
since 17 days now (since when post_change_branch_tip hooks can call a
server-side plugin) I think Bazaar is the right one. Thanks, Andrew!

Have a nice day!
Viktor