Added DefaultReportType property to Qso mode table in
AdifEnumerations.xml.
Added a Report Text panel to the QSOs Box section of
UserPreferencesDialog. On this panel, added radio buttons to control
whether all modes use the same report header on the QSL cards or
separate QSOs by report header type.
Modified program initialization to build a list in UserPreferences
file of the header type by mode if necessary.
Note: QSL card printing has not yet been modified to use this list.