MC: default MC_YAWRATE_I changed for all setups, navigator: increase yaw acceptance to 0.2rad ~ 11deg
mavlink: REQUEST_DATA_STREAM hadling implemented
rcS: removed unnecessary sleeps, minor code style fixes
commander: don't beep if message is not understood
mavlink: implemented multicasting between mavlink instances (two options: forwarding: forward received messages from self to other mavlink instances, passing: send out messages received from other mavlink intances over serial
mavlink: in normal mode transmit position setpoint and roll-pitch-yaw-thrust setpoint
mavlink: publish SYS_STATUS at constant rate, don't look at update() result
commander: put unsupported warning back in place
mavlink: use LL_FOREACH
Send camera command to all, use own sysid
gps driver: fake mode: lower eph and epv values in order to convince the commander that the gps signal is valid
mavlink: accessor for _mavlink_fd
commander: handle_command: filter commands by sysid and componentid
mavlink: COMMAND_LONG stream: listen to vehicle_command uorb topic and send mavlink_msg_command_long
commander: handle_command: do not filter command if componentid == 0
position_estimator_inav: make land detector more sensitive to LANDED -> IN AIR transitions
mavlink: commands stream implemented
mavlink: minor comments and formatting fixes
Revert "Merge pull request #816 from PX4/mavlink_commandlongstream"

This reverts commit 00ef10f307d3c4a262a15ab5747d854eb4c568d5, reversing
changes made to d55e64d1e54542762510387a22897f504c68a5a6.
Added VICON logging, finally.