hotfix:
when a survey appeared in a run twice (rare occurrence) a sloppy join led to
it appearing twice. have simply removed the functionality to refer to a datasets
position in a run for now
Merge branch 'hotfix/duplicate_records_when_survey_twice_in_run' into develop
Merge branch 'hotfix/duplicate_records_when_survey_twice_in_run'
make choice sheet creation contingent on existence of choices
Merge branch 'hotfix/export_item_table' into develop
Merge branch 'hotfix/export_item_table'
closes #69
closes #70
closes #71
Merge branch 'hotfix/dont_show_null_warnings' into develop
Merge branch 'hotfix/dont_show_null_warnings'
empty arrays
Merge branch 'hotfix/fix_null_opencpu' into develop
Merge branch 'hotfix/fix_null_opencpu'
Merge branch 'master' into feature/run_settings
Merge branch 'develop' into feature/run_settings
view and some backend for overview script
clean up run.js
better object orientation and encapsulation of run.js, simplified code where possible
put all single_unit_displays into settings, possible thanks to better encapsulation of run.js