temporary work-around for filter-efficiency in task chain root task
Old workflows registration when migrating a request from PREP. fixing #662 and #656

Signed-off-by: PdmV Service <pdmv.service@cern.ch>
Merge pull request #655 from vlimant/task_filter_patch

temporary work-around for filter-efficiency in task chain root task
Merge remote branch 'mcm_origin/master' into processing_string_support