Various asserts can fail if events are triggered before data load!

The Locus features being edited (when saving transcripts) were using feature->type not style->mode.

New code copies style->mode into feature->type if style has mode.

zMapFeatureAnyForceStyleMode should catch the rest...

The Locus features being edited (when saving transcripts) were using feature->type not style->mode.

New code copies style->mode into feature->type if style has mode.

zMapFeatureAnyForceStyleMode should catch the rest...

- BadWindow errors in tk, not being caught by it's error handler. (nested zmapXTrapError calls!)
- DeleteNotify events in queue from old windows erroneously causing window destroyed messages.
- Object creation logic

completely rejig exit code, now we wait until all threads have quit before sending finalise and exit comes in widget destroy.