Ingar, thank you very much, now netradiant recognizes Tremulous, the only detail wrong is that of course TremulousPack must be placed in the same folder as NexuizPack, but however, this is not too hard to figure out.
However, when opening tremor.map, some textures are still not visible, just like before. My first try to render the map produced a map that appears to be messed up.