Added Volume_Sp variable in config
Added DZ_Elev configuration value
Split flush into three parts
Remove direct flush when header is written
Removed timing analysis code
Merge pull request #42 from crwper/fix_overflow

Fix UART overflow and timing issues
Merge remote-tracking branch 'origin/add_ground_elevation'
Merge remote-tracking branch 'origin/add_speech_volume'
Improved description of configuration parameters
Merge pull request #43 from crwper/add_speech_volume

Added separate speech volume control
Merge pull request #44 from crwper/add_ground_elevation

Add ground elevation parameter
Changed default speech volume to 8
Merge pull request #45 from crwper/change_default_speech_volume

Changed default speech volume to 8
Merge remote-tracking branch 'upstream/master'
Moved tone and speech update to UBX_ReceiveMessage
Handle alarms and tones only with fix
Separate alarm and tone handling
Use Tone_SetRate instead of UBX_SetTone to disable tones
Rename update functions
Moved previous hMSL to static variable