Filter match proposals
Users like to filter match proposals by provider. So they can first go trought ll the proposals with a possible matches with provider A, then provider B.
Use-Case: A provider matches data with metagrid. She/he knows, there will be allot of matches to the HLS. So the most efficient strategy to go trough the matches would be by first all proposals with the hls, then with lonsea and then with dodis. This would make things more efficiant