Find Bugs and fix them (as always)

oldcyberdude - Add a spectrum type display tabbed in the mainview to select either waterfall or spectrum
oldcyberdude - Add a display of input audio signal and adjustment of input level
kg9ni - Find a way to print and export the logbook to other functions
kg9ni - Add export and import of logbook data for ADIF and Cabrillo formats
kg9ni - Add user-configurable signal markers

