Postgresql update

Closes #237

See merge request !93

Prevent issue from duplicated entries

Closes #240

See merge request !92

parse the file before actually saving it, raise error during form validation instead of showing messages after save
WIP #240

 * add documentation about duplicate not allowed
 * use update_or_create to overwrite duplicate
 * check when parsing, and notify of duplication
 * add example on how it should work

#240 (comment 39577)

redirect to data source list when curator switch back to private a datasource...

See merge request !91

redirect to data source list when curator switch back to private a datasource that zhe cannot see anymore
WIP #241

closes #242

update curator permissions

See merge request !90

Closing #239

split deploy in two steps

See merge request !89