renamed "batch_feature_extraction" to "batch_jobs" workflow.implemented three workflows for more and less frequently used imports and less frequently used updates.
added new batch process for the all-feature-extraction image.unified user defined start_date and end_date parameters, injected within the params.json, as a datetime string (not date string).
added functionality which automatically extends the task limitation as required by RangeDaily tasks.moved the services/luigi/workers parameter within the params.json to workflow/workers; avoids property-overwriting by the workflow manager which replaces the services-node with standard values.
fixed several concurrency issues.
fixed pep8 issues.
redesigned the RunDocker base-class and added two new targets: PostgresTargetV2, TaskRunTarget.luigi-tasks now also consider their parent tasks to check wherever they have to be executed or not.
the code is not yet cleaned up.
fixed complete() method of the DockerRun class:checks not only if the algorithm was run succesfully in the past but also if new data are available by upstream algorithms