(1) Added subroutine taskadmin to serve as "lio's main".

 (2) Retouching lio_init; together with a different version
     of a "lio_finalize" (to be renamed probably) these should
     be called to start and end the program and, together with
     taskadmin, will probably be the only subroutines to be called
     directly by the program using liolib. Initialization of
     variables that change in each call to the program whould
     be dealt with inside the taskadmin; lio_init and "lio_finalize"
     (not the existing one, the planned one) should be called only once.

 (3) Moved "mods" to "liomods" and started a mod for keywords
     (liokwrds). This way "mods" is free to be used a folder
     to store the .mod files (insted of just leaving them in
     the main directory).