remove some long obsolete perl files
NavCheckWaypoint function added
update changelog
first release candidate for next release v5.2
[apogee] fix apogee example file compilation
[nav] Checking time function was working only for first wp, fixed now.
[ins] fix ins_reset_altitude function for LTP def

- before, lla and ecef where not consistant after reset on altitude only
- set ltp accel in invariant filter
[apogee] configurable pwm outputs
[intermcu] Bugfix: size. Rename global defines. Led on Rx instead of Tx.
[conf] Tested airframes
[intermcu] Fix + process all messages without delay
[server] lat lon are received in radians
[guidance] fix rotation matrix
[mcu_periph] Fix error sending
[tests] Fixed build of PWM tests
[bmp085] Fix calibration reading with errors
[fix] typo in githelper script

close #710
[ardrone] Slow-Down Heading rate
[energy_ctrl] Energy loops not being called. Code commenting.
[airframe] Default Energy Gains Simulator