add mpbb component to Trac

[ryandesign (Ryan Carsten Schmidt)]

I feel that since mpbb has its own git repository, it should have its own Component in Trac. Filing mpbb tickets under contrib isn't right because it's not in the macports-contrib repo, and filing them as server/hosting is wrong because they're about the development of the mpbb software, not the installation of it on a server.

I see the place in Trac Admin where I can add components, but I don't remember if on the Braeburn Trac setup we're supposed to use that or if a server config file needs to be edited instead.

[raimue (Rainer Müller)]

You can just add new components in the Trac Admin web interface, as these are stored in the database. Only the changes to ​trac.ini should be done via Git to have them properly versioned with the rest of the trac environment.

[neverpanic (Clemens Lang)]

I think mpbb is closely related to our buildbot setup, so I'm going to rename the category to buildbot/mpbb. I'm also adding a new component for tickets filed against trac.