Bug fix: Form showing now works properly.

The OrnamentSettingsForm was not showing
its parent form correctly
Added msOffset property to SeqRef class

This is the msPositionInTheScore of the
referenced Seq, relative to the triggering
inputNote.
PaletteChordForm improvements

The basic chord fields and the ornament setting
fields are now Enabled/Disabled correctly, and
the PaletteChordForm interacts better with its
parent PaletteForm.