Added extra command line parameters (default, rundir, database). Added validation for a.o. wrongly specified parameterMappings of which origin (stepx_ or user_) is unclear. Fixed some bugs to make impute2 pipeline generating.
Added -path parameter to workflow.csv, parameters.csv, ... And fixed some bug.
Merge pull request #293 from mdijkstra/master

Created impute2 workflow. Added extra cmnd-ln-parameters. Fixed bugs. Added error handling for wrong parameterMapping.