added frappy_config to frappy setup

frappy_config allows to configure how SE aliases are generated
set_se_list applies this to create aliases and update the envrionment

devices.py

@@ -33,6 +33,7 @@ from os.path import expanduser
 from nicos import config, session
 from nicos.core import Override, Param, Moveable, status
 from nicos.devices.secop import SecNodeDevice
+from nicos.core import Device, anytype, listof
 from nicos.utils.comparestrings import compare
 from servicemanager import FrappyManager
 
@@ -45,6 +46,22 @@ def suggest(poi, allowed_keys):
     return [m[0] for m in comp[:3] if m[1] > 2]
 
 
+class FrappyConfig(Device):
+    parameters = {
+        'temperature': Param(
+            'device name for sample temperature', type=anytype, default=['Ts', []]),
+        'temperature_regulation': Param(
+            'device name for temperature regulation', type=anytype, default=['Tr', []]),
+        'magneticfield': Param(
+            'device name for magnetic field', type=anytype, default=['B', []]),
+        'nodes': Param(
+            'list of names of potential SEC nodes', type=listof(str), default=[]),
+    }
+
+    meanings = list(parameters)
+    meanings.remove('nodes')
+
+
 class FrappyNode(SecNodeDevice, Moveable):
     """SEC node device