Set DisplayQsos.IsDirty to true when user inputs one or more QSOs
using the QsoInputDialog or when a QsoException occurs when
importing or adding QSOs from an ADIF file.
This fixes issue #120.
Modified IncludeAllQsos, ExcludeAllQsos, and SetIncludesChecked in
DisplayQsos to keep the IsDirty property when one or all Include
checkboxes are toggled.
Update program and installer version numbers to 1.0.8.