conform to other REST apis
Merge pull request #1556 from marcel-blonk/PLFM-3045

conform to other REST apis
Merge pull request #1557 from marcel-blonk/PLFM-2987

Handle aggregate columns and don't break on new file handles
Make thread safe, don't use long
Merge pull request #1558 from marcel-blonk/PLFM-currentcache

Make thread safe, don't use long