Cleaning up the gcc priority
Fixed spaces and comments
delegate host list update to main thread
fix unused-parameter warnings
Merge pull request #421 from LocutusOfBorg/169-fix2

Cleaning up the gcc priority
Merge pull request #423 from koeppea/fix-unused-param-warinings

Fix unused param warinings
Merge pull request #422 from koeppea/scan-crash

Fix Scan crash