various small fixes

- fix some earlyInit and initModules methods
- remove some comments
- change name of Done unique value to 'Done', this seems more
  useful for __repr__ and debug logging

Change-Id: I73f0e09bfef858ddca11bba0e92e941ebc151160
Reviewed-on: https://forge.frm2.tum.de/review/c/sine2020/secop/playground/+/27907
Tested-by: Jenkins Automated Tests <pedersen+jenkins@frm2.tum.de>
Reviewed-by: Enrico Faulhaber <enrico.faulhaber@frm2.tum.de>
Reviewed-by: Markus Zolliker <markus.zolliker@psi.ch>

secop_psi/softcal.py

@@ -165,6 +165,7 @@ class Sensor(Readable):
     enablePoll = False
 
     def initModule(self):
+        super().initModule()
         self._rawsensor.registerCallbacks(self, ['status'])  # auto update status
         self._calib = CalCurve(self.calib)