cleaned up query-functions in StarExec.Concurrent, hopefully more DRY...
added additional infos to ShowJobPairR
refactored StarExec.Commands.getJobResults from type "Maybe [JobResultInfo]" to "[JobResultInfo]"
added data-type JobResultStatus to persist-type JobResultInfo
	-> if status isn't complete, then update pair-info from star-exec (yet to be implemented)
concurrent querying in ShowManyJobResultsR (almost forgot that^^)
failed attempt to preload all completed job-pairs