* check that 2llib works with several files at once - DONE
* give an api for applictions to specify the file name - just use the
existing init_from_text_representation() - DONE
* remove the profiling stuff from biditext - DONE
* check that you can switch file names while running. - no problem, if
you use different r2llib tokens - DONE
* add error handling - check that the user supplied token is valid, and
that we can create/remove the file the user specified (check with stat
on the dir) - DONE

write more tests. 
review the code. 
look for possible races. 
make all file names absolute file names