Fixed code to display zero swing dice correctly in the UI and the log
Fixed responder test
Merge pull request #1457 from blackshadowshade/1449_zero_swing_display

Fixed code to display zero swing dice correctly in the UI and the log
Merge remote-tracking branch 'upstream/master' into 1467_twin_swing_bug
- Added BMFlagIsAsymmetricTwin to BMDieTwin->recalc_max_min()
- Fixed logic for twin swing die loading
- Updated responder test