adding testcase for auxiliary types: read out allowed values from schema and make sure the lookup scceeds

refactoring of XML validation: consider schema version number read from document, use single class for validating all vecto-related xml files

refactoring of VTP engine - no speed limits, compute engine torque demand based on power demand and engine speed from cycle to compensate for wrong gear selection

add condition in measured speed cycle: if the remaining interval to the next sampling point is too low, reduce the current simulation interval and thus prolong the next one