Update year to 2018

Also there was no register xPSR.

Stack usage calculation is still broken...

    - sitl_gazebo in PX4/Firmware (1ee08da9): https://github.com/PX4/sitl_gazebo/commit/651ca351fd1030870b42528db17e4fe2816d46e5
    - sitl_gazebo current upstream: https://github.com/PX4/sitl_gazebo/commit/371e7c36c34d7dd45da5602a14a6ee01e9fe74db
    - Changes: https://github.com/PX4/sitl_gazebo/compare/651ca351fd1030870b42528db17e4fe2816d46e5...371e7c36c34d7dd45da5602a14a6ee01e9fe74db

    371e7c3 2018-04-10 korotkoves - udp port for each model instance from options file
376258d 2018-04-17 korotkoves - change file format to use common and model specific parameters
b4b7245 2018-01-17 korotkoves - function to load parameters for each model from xml file

- analysed_logdata: add filter_fault_status check to test_results
dictionary to prevent a missing entry exception
- analyse_logdata: fix one-off errors of list indices due to python
non-inclusive end indices

When SYS_USE_IO was disabled, px4io would not start and thus there was no
RC. SYS_USE_IO=0 is interesting on Quads to avoid the IO and reduce output
latency.

Tested on Pixhawk 1 and Pixhawk 4

If MT messages are waiting on the server immediately restart a new session.

* Fix link to flight reporting page

Useful for 4-in-1 ESCs such as the Hobbywing XRotor Micro 40A 4in1
where the FC can be directly plugged on top.

- Catch the case where the case where the driver gets stuck because nothing is received by +SBDRB
- Add a mutex for the rx buffer
- Stop the standby loop if a mode change is already scheduled

- Move publishing the telemetry status from the IridiumSBD driver to the mavlink instance
- In the commander use the iridiumsbd_status message for heartbeat in case of a high latency link
- Move positive acknowledge to the mavlink instance
- Add a failed acknowledge in the commander if no high latency link exists

* Add return to land to mission

This method uses the planned mission for rtl. If a landing sequence
is present it will continue the mission and land. If not it will
fly back the mission and loiter/land at the home position.

These are the default github examples and need to be customized.

https://blog.github.com/2018-05-02-issue-template-improvements/

Reduces FLASH usage by about 4KB

Command to replace:
for i in *.mix; do sed -r -i '/O: +10000 +10000 +0 +-10000 +10000/d' $i; done