all: rename parameters to accessibles in module classes

+ make accesses to <module>.parameters work again

Change-Id: I91c09b0f9f5f28d78cd644f83a96c8772e5977e5
Reviewed-on: https://forge.frm2.tum.de/review/20249
Tested-by: JenkinsCodeReview <bjoern_pedersen@frm2.tum.de>
Reviewed-by: Markus Zolliker <markus.zolliker@psi.ch>
Reviewed-by: Enrico Faulhaber <enrico.faulhaber@frm2.tum.de>
Tested-by: Enrico Faulhaber <enrico.faulhaber@frm2.tum.de>

secop/metaclass.py

@@ -206,5 +206,10 @@ class ModuleMeta(type):
                 if attrname[3:] not in newtype.accessibles:
                     raise ProgrammingError('%r: command %r has to be specified '
                                            'explicitly!' % (name, attrname[3:]))
+
+        # provide properties to 'filter' out the parameters/commands
+        newtype.parameters = dict((k,v) for k,v in newtype.accessibles.items() if isinstance(v, Parameter))
+        newtype.commands = dict((k,v) for k,v in newtype.accessibles.items() if isinstance(v, Command))
+
         attrs['__constructed__'] = True
         return newtype