- L1GtVhdlWriterCore: get rid of an unnecessary const_cast
  - L1GtTriggerMenuXmlParser: fix the input parameter of strtol

…e EventSetup

L1GtTriggerMenu is now properly initialised by the EventSetup framework,
so there is no longer need to call

  (const_cast<L1GtTriggerMenu *>(l1GtTriggerMenu))->buildGtConditionMap();

or to keep a local copy for that purpose

  - change most configuration parameters into const members
  - change into a stream::EDProducer