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/MotorTweak.py

@@ -115,11 +115,20 @@ class MotorTweak(QWidget, Ui_MotorTweak):
 
 
   def move_rel(self, dist):
+    m=self._motor
+    rbv=m.get_position(readback=True)
     try:
-      self._val+=dist
+      self._val=rbv+dist
     except AttributeError:
       pass
-    self._motor.move(dist, ignore_limits=True, relative=True)
+    m.move(self._val, ignore_limits=True, relative=False)
+    #old code move relative to VAL not relative to RBV
+    #try:
+    #  self._val+=dist
+    #except AttributeError:
+    #  pass
+    #self._motor.move(dist, ignore_limits=True, relative=True)
+
 
   def is_done(self):
     m=self._motor