Added doxygen comments in uavobjectbrowserwidget.
Renamed UAVOBrowser SLOT function. Improved several other comments.
Additional doxygen comments updates.
Fixed spelling on "hilight".
Changed "enableUAVOButtons" to be less confusing with
"enableUAVOBrowserButtons".
Merge pull request #249 from TauLabs/kenz/uavobrowser_comments

Added doxygen comments in uavobjectbrowserwidget.