populate service/provider name and mux in PVR_SIGNAL_STATUS
sync pvr api with mainline repo
adapt addons to pvr api change, add timeshift buffer methods

Conflicts:

	addons/pvr.argustv/addon/addon.xml.in
	addons/pvr.argustv/addon/changelog.txt
	addons/pvr.mythtv.cmyth/addon/addon.xml.in
	addons/pvr.mythtv.cmyth/addon/changelog.txt
bump pvr add-ons to 1.9.0
sync copyright notices
bump add-ons to 1.9.0. added stubs in dvblink
Merge branch 'api-1.9.0'. closes #215. closes #227
Merge remote-tracking branch 'pvr/master'