implement basic configuration cache for EigerReceiverImplementation
adapt eigerReceiverTest to do more checks and make output more readable
improve error tests in EigerReceiverImplementation::initialize()
git-svn-id: file:///afs/psi.ch/project/sls_det_software/svn/slsDetectorSoftware@789 951219d9-93cf-4727-9268-0efd64621fa3