improve service manager

- do not start sea server automatically
- replace _SERVICE in FRAPPY_HISTORY by service name
- imporve error messages
- no fiddling around with sys,path, reply on PYTHONPATH for
  finding packages

__init__.py

@@ -68,7 +68,7 @@ def run(group, arglist):
         try:
             serv.action(action, *arglist)
         except AttributeError:
-            raise UsageError("do not know '%s'" % ' '.join([serv.group, action] + arglist))
+            raise
     except UsageError as e:
         serv.usage()
         print('ERROR:', str(e))