Turn off JTAG completely in a vain attempt to get PB4 free for SBUS enable.
Be more enthusiastic with the sbus enable pin. Still no love.
Mavlink: bring mavlink log messages to life
Defconfig: allow for more file descriptors
Merge remote-tracking branch 'px4/beta' into beta_mavlink

Conflicts:
	src/modules/mavlink/mavlink.c
	src/modules/mavlink/mavlink_receiver.h
	src/modules/mavlink/orb_listener.c
Mavlink: enable log messages to multiple UARTs
Mavlink: don't allow multiple instances on the same device
Don't leave all JTAG off... it will make you very sad
Remove the s.bus test loop... makes it very hard to update the firmware.
Make SBUS output exclusive
Ensure only either S.BUS1 or S.BUS2 can be active at a time
Mavlink: allow to stop (WIP)
Mavlink: allow to stop (compiling, working)
Mavlink: Start multiple uart listeners, HIL working
Mavlink: Don't support mavlink stop so that QGC doesn't stop mavlink before it starts rc.usb
Merge remote-tracking branch 'px4/beta' into beta_mavlink
Mavlink and navigator: handle current waypoint onboard
Merge branch 'beta' into beta_mavlink
Merge remote-tracking branch 'px4/beta' into beta_mavlink
Mavlink: gotten rid of some warnings