Document Vim setup for Git commit messages

Change-Id: Iaaa4d750ab894a77b4720b5e971a8abd829c2785
Merge "Document Vim setup for Git commit messages"
Refactor: Extract group list manipulation

The group list manipulation is now encapsulated in a dedicated GroupList
class.

Change-Id: Id134d6a2eaab255ae167f4c401fca1690ac0985d
Allow to manipulate All-Projects's group list in init step

The group list in the All-Projects project can now be manipulated
in an init step. This is required to configure access rights
programmatically in an init step.

Change-Id: If9d633b3642131d8d656025ad89beca2d3346132
Merge "Refactor: Extract group list manipulation"
Merge "Allow to manipulate All-Projects's group list in init step"