Consistent definition of simulation modi

[tfesenbecker]

Once we actually merge the feature/caching and master branch we need to come up with a consistent way of defining and documenting for which kind of user input caching effects are simulated (propably when storage objects are defined), how jobs with input file information should be treated when no storage objects are defined (use file transfer mechanism like with caching but only with remote connection?) and whether we want a command line flag that allows to disable caching on the fly.