Added a script to import GMF from .xml or .csv files
Added a comment
uiapi.output.oq_job_id is now nullable
aAdded engine/tools directory and moved some files around
Removed a test moved in the right place
Improvements requested in https://github.com/gem/oq-engine/pull/1110
Moved the import_gmf_scenario functionality into bin/openquake
Merge pull request #1110 from gem/1160398

Importing GMF from XML: step 2