Fix base clock frequencies for timers 9/10/11 (not currently used).

Thanks to xiazibin@gmail.com for pointing these out.
Add a lot of MAVLink parameter documentation.
Layout fixes for wiki parameter documentation.
- Replace newlines in names and comments with a space.
- Right align min/max/default values.
Added comments for L1 control parameters
Missing descriptions added for L1 control parameters
Fix airspeed sensor
Fix compile errors
Merge pull request #670 from PX4/airspeed_path_fix

Fix airspeed sensor
Rename parser.py to srcparser.py to prevent naming conflicts with built-in Python parser library.
Fixes for Python 3: Use sorted() with key parameter instead of deprecated (and removed) cmp() function.
Fixes for Python 3 and refactoring: Merge generic Output class into specialized output classes as some need to write files in binary mode.
Merge branch 'beta' of https://github.com/Highlander-UA/Firmware into param_docs
Fixed Doxygen comments and added parameter documentation group.
Fixed status printing for airspeed sensor
Merge branch 'beta' of github.com:PX4/Firmware into beta
Fixed illegal character 0x96.
Explicitly treat all files as UTF-8.
Merge pull request #671 from PX4/param_docs

Parameter documentation enhancements
MPU6000: gyro topic was not initialized
Merge pull request #672 from PX4/hotfix_mpu6000

MPU6000: gyro topic was not initialized