Barometer issues (ALT_HOLD, LOITER, STABILIZE)

**Details**
GPS OK
Change mode -STABILIZE, ALT_HOLD and LOITER
Barometer issues

**Comands**
*Stabilization*
mavgraph.py 37.BIN "ATT.DesPitch" "ATT.Pitch" --flightmode=apm
mavgraph.py 37.BIN "ATT.DesRoll" "ATT.Roll" --flightmode=apm

*IMU*
mavgraph.py 37.BIN "IMU.AccX" "IMU.AccY" "IMU.AccZ" --flightmode=apm
mavgraph.py 37.BIN "IMU.AccX" "IMU.AccY" "IMU.AccZ" --flightmode=apm

*LOITER*
mavgraph.py 37.BIN "NTUN.DVelX" "NTUN.VelX" --flightmode=apm
mavgraph.py 37.BIN "NTUN.DVelY" "NTUN.VelY" --flightmode=apm

*GPS*
mavgraph.py 37.BIN "GPS.Lat" "GPS.Lng" --flightmode=apm
mavflightview.py --imagefile output.jpg 37.BIN

*Altitude measurements*
mavgraph.py 37.BIN "CTUN.BarAlt" "CTUN.Alt" "CTUN.DAlt" --flightmode=apm