Add key commands to mark patch as reviewed

Add a key command to toggle the reviewed flag for a patch.

In addition add another key command to mark the patch as reviewed and
navigate to the next unreviewed patch. This is the same streamlined
workflow as implemented by 1481c2ed1a58a43f7a972acd883444ae2b2d2e2b.

Bug: issue 1510
Change-Id: I322814cde19921ea424990f701d52b6fb040168b
Signed-off-by: Edwin Kempin <edwin.kempin@sap.com>
3 files changed