fixing coordTrf stuff and screen updating

- fix sign error in transformation for z
- MotorTweak.py rel_move relative to RBV not VAL
- SimMotorTweak.py move emits also RBV to update objects in SwissMX
- update Readme.md

epics_widgets/SimMotorTweak.py

@@ -111,6 +111,7 @@ class SimMotorTweak(QWidget, Ui_MotorTweak):
         _log.debug('{} rel move => {} {:5.4g}'.format(self._label, dist,m._pos))
         self.update_label()
         self.emit_signals(source_field='VAL')
+        self.emit_signals(source_field='RBV') #force to cal track_objects() in swissmx
 
     def get_rbv(self):
         return self._motor._pos
@@ -156,6 +157,7 @@ class SimMotorTweak(QWidget, Ui_MotorTweak):
         m._pos=drive
         self.update_label()
         self.emit_signals(source_field='VAL')
+        self.emit_signals(source_field='RBV') #force to cal track_objects() in swissmx
 
     def emit_signals(self, **kw):
         m=self._motor