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.
Merge branch 'master' into v1.2