Update the git-archive export options

The .gitattributes, .gitignore, .commit-template files do not need to be
present in packaged sources, as they are for people using the Git
repository.  People who download tarballs usually don't reimport into
Git -- they should just download the actual repositories.

Meanwhile, the .tag file is quite useful. Instead of making Git extract
to the useless SHA-1 of the "$Id$\n" string, ask git-archive to store
the SHA-1 of the commit being packaged.

Change-Id: Id6674657a9072d875e13771aadde842e1dfb3b93
Reviewed-by: Iikka Eklund <iikka.eklund@digia.com>
Doc: Setting navigation bar variables in qdocconf file.

Used for navigation in offline mode.

Change-Id: I7bd9f11c14cd2197bbc3f5039500a04f5aa4747d
Reviewed-by: Jerome Pasion <jerome.pasion@digia.com>
Merge remote-tracking branch 'origin/stable' into dev

Change-Id: I150f544a868db3712d78439af53924e90d29a39d