remove useless Upstart.EmitEvent call for "vdr-plugin" event

recent Upstart version only accepts events from root
Merge remote-tracking branch 'upstream/master'
update changelog
don't overwrite config files
add some vdr 2.1.x compat stuff
Merge remote-tracking branch 'upstream/master'
update changelog
create the directories before copy
Merge remote-tracking branch 'upstream/master'
add two new SVDRP commands

SetDBusSessionBusAddress
SetUpstartSession

(un)sets the environment values for DBUS_SESSION_BUS_ADDESS and UPSTART_SESSION
Merge remote-tracking branch 'upstream/master'
update changelog
start/stop session-bus connection on address changes
Merge remote-tracking branch 'upstream/master'
Merge branch 'master' of github.com:yavdr/vdr-plugin-dbus2vdr
increase version to 21
Merge remote-tracking branch 'upstream/master'
new upstream release v21
add vdr-abi dependency
add new status call ChannelChange