Merge branch 'jc/submittingpatches'

Streamline the document and update with a few e-mail addresses the patches should be sent to. * jc/submittingpatches: SubmittingPatches: give list and maintainer addresses SubmittingPatches: remove overlong checklist SubmittingPatches: mention subsystems with dedicated repositories SubmittingPatches: who am I and who cares?