Copter: revert pre-arm check for slow GPS
Copter: update -rc7 release notes
Copter: commit to kick-off auto rebuild for -rc7 release
Copter: log GPS messages even when no fix
Copter: remove unused gps_fix_count
GCS_MAVLink: increase max packet size to 104

this enables the DATA96 packet to be sent
autotest: use mavflightview.py from $PATH
Copter: run GPS glitch detection even when not armed