Adapt sim_* cfg's to current syntax

+ make 'limit' usable as type in cfg files
+ minor fixes

Change-Id: Ib94b2645c7a0d978d64d4c86c4415d4b5b0d485f
Reviewed-on: https://forge.frm2.tum.de/review/c/sine2020/secop/playground/+/21485
Tested-by: Enrico Faulhaber <enrico.faulhaber@frm2.tum.de>
Tested-by: JenkinsCodeReview <bjoern_pedersen@frm2.tum.de>
Reviewed-by: Enrico Faulhaber <enrico.faulhaber@frm2.tum.de>

secop_mlz/entangle.py

@@ -386,7 +386,7 @@ class AnalogInput(PyTangoDevice, Readable):
         # prefer configured unit if nothing is set on the Tango device, else
         # update
         if attrInfo.unit != 'No unit':
-            self.accessibles['value'].unit = attrInfo.unit
+            self.accessibles['value'].datatype.setProperty('unit', attrInfo.unit)
 
     def read_value(self):
         return self._dev.value
@@ -469,7 +469,7 @@ class AnalogOutput(PyTangoDevice, Drivable):
         # prefer configured unit if nothing is set on the Tango device, else
         # update
         if attrInfo.unit != 'No unit':
-            self.accessibles['value'].unit = attrInfo.unit
+            self.accessibles['value'].datatype.setProperty('unit', attrInfo.unit)
 
     def pollParams(self, nr=0):
         super(AnalogOutput, self).pollParams(nr)