*8015* Introduced file loader base task class
[OJS.de - OA-S II - ap 5: metrics API] metrics table
[OJS.de - OA-S II - ap 6: default metric type] implement
[OJS.de - OA-S II - ap 3: OAI interface] necessary metadata framework improvements
[OJS.de - OA-S II - ap 6: default metric type] implement
[OJS.de - OA-S II - ap 8: tests] make requests easier to test
[OJS.de - OA-S II - ap 4: load statistics] download of statistics from OA-S