Add new settings for modes in preferences. ComboBox for modes showes only configured modes.
Load defaults for frequency and mode in Preferences/NewQSO.
Configuration of Modes for NewQSO in Preferences/NewQSO.
Corrected one issue in dmUtils.InsertModes

Load defaults for frequency and mode in Preferences/NewQSO.
Configuration of Modes for NewQSO in Preferences/NewQSO.
Merge pull request #14 from DL7BJ/master

Preferences for modes and frequencies