Please start commit message with port name.

[petr]

Hi Vincent,

I'd like to propose to start commit messages with the port name. This helps very much to read them for example in the Timeline.

For example:

https://trac.macports.org/changeset/127794 -- Correct various bugs. Bump to revision 1.
https://trac.macports.org/changeset/127795 -- Bump to version 2.1.4

could become:

 - gdal: Correct various bugs. Bump to revision 1.
and
 - postgis2: Bump to version 2.1.4
respectively.

I believe there is also some policy on this.

Thanks, for considering this!
~petr