WIP Scoped reports

Scope reports by repository

Show info message if there are no repositories available to a user (lost after redesign);

Fix report tests after repo scoping change
Make unprocessed_accessions_report show accessions without a collection management record and those with NULL status values; warn developers if a report URI has already been registered (as exception was being raised after hotcode replacement); Default format in report form to previously selected value upon receiving an error;
Fix unprocessed_accessions_report SQL to work for both MYSQL and Derby
Merge pull request #369 from hudmol/repo-scoped-reports

Scope reports by repository