Remove useErrorsFromParam, hitErrorRZ, and hitErrorRPhi configuration parameters

Remove the parameters from configuration, and the corresponding members of SeedingLayer and SeedingLayerSetsBuilder. The members seem to have been unused since CMSSW_3. Removing the functionality simplifies further development of SeedingLayerSetsBuilder, and removing the parameters with no effect hopefully makes the configurations less confusing. The PR is based on 7_0_0_pre12.

HN thread: https://hypernews.cern.ch/HyperNews/CMS/get/recoTracking/1416.html

@Martin-Grunewald I hope this one is straightforward for ConfDB GUI, but let me know if anything further will be needed.