Adding note.
Ability to set a custom quiet period.
Added test for multiple SCM checkouts in a single build.
Note that GitSCM currently ignores SCMRevisionState and does things its own way, using BuildData.
This has the unfortunate effect that it will refuse to create more than one changelog
in case you have multiple checkouts of the same repository (say, different branches)
because it does a lookup of data from the last build using the repository URL as a key.
Thus this test is forced to create multiple repositories.