fix ppms with proxy

- proxy: remote parameter status should overddide datatype from
  ProxyModule.status
- ppms: create PpmsDrivable instead of importing from
  (PpmsBase, Drivable). Order matters for status parameter!
- update cfg files

Change-Id: If8fc263cffb903d8b3c1a93a089dcac3597d13a0
Reviewed-on: https://forge.frm2.tum.de/review/c/secop/frappy/+/30512
Tested-by: Jenkins Automated Tests <pedersen+jenkins@frm2.tum.de>
Reviewed-by: Markus Zolliker <markus.zolliker@psi.ch>

cfg/softcal_cfg.py

@@ -1,16 +1,20 @@
-Node('r3',
-    'temp sensor on 3He system',
-    'tcp://pc12694:5000',
-    cls = 'frappy.core.Proxy',
-    remote_class = 'frappy_mlz.amagnet.GarfieldMagnet',
-    #remote_class = 'frappy.core.Readable',
+Node('softcal.demo.example',
+    'convert r2 from PPMS to a temperature',
+    'tcp://5001',
+)
+
+Mod('r2',
+    'frappy.core.Proxy',
+    'convert r2 from PPMS to a temperature',
+    remote_class = 'frappy.core.Readable',
+    uri = 'tcp://localhost:5000',
     export = False,
 )
 
-Mod('t3',
+Mod('T2',
     'frappy_psi.softcal.Sensor',
     '',
     value = Param(unit = 'K'),
-    rawsensor = 'r3',
+    rawsensor = 'r2',
     calib = 'X131346',
 )