determine environment from alias definitions

secop devices are added automatically to the environment if the
appear in the alias_config. secop devices no longer available
are remove from the envrionment list.

+ fix rename nicos_sinq/frappy to nicos_sinq/frappy_sinq

setups/frappy_addons.py

@@ -4,7 +4,7 @@ group = 'optional'
 
 devices = {
     'se_addons':
-        device('nicos_sinq.frappy.devices.FrappyNode',
+        device('nicos_sinq.frappy_sinq.devices.FrappyNode',
                description='SEC node', unit='',
                prefix='se_', auto_create=True, service='addons',
         ),