Tuning Setup: Add new CH6 and CH7/8 options
Range Finder: Initial implementation 

This implementation removes the old unreliable SONAR_TYPE setup.
Graph View: Fix #432 and Fix #431, issue parsing QByteArray into values, switched to use QDataStream to prevent future issues
Graph View: Fix #435, table view of loaded log data now adjusts column headers from keyboard and mouse input
Graph View: Fix #422, items in treeview are now sorted alphabetically
Graph View: Fix #420 auto-zooming the graph when the first value is inserted
Merge remote-tracking branch 'upstream/master' into 274
Docs: updated README.md to fix #430
Graph View: Fix #227, graph tooltip displaying on wrong monitor in a multi-monitor environment
Comms: Fix #438 baud rates were not being remembered by com port name
Merge remote-tracking branch 'upstream/master' into 274