Enable the readers including kvtml-1 also in code and finish porting it to a works somewhat state.

Reading subwordtypes is still not working because they are not created correctly in the init section of the compability class.

Remove last references to usage stuff (no one will miss it).

Some cleanup of the horrible horrible kvtml-1 reader code.

I will have to drop the kvtml-1 writer. Too much effort and too many things that cannot be saved in the old format.