b) prevent transport motion if stop-at-session-end is true
c) ensure that (more) menu items that provide control over Configuration object options are in the correct state at startup
d) Configuration options removed from "have a session" sensitivity toggling
e) removed functionally empty default_keys.cc
git-svn-id: svn://localhost/trunk/ardour2@433 d708f5d6-7413-0410-9779-e7cbd77b26cf
