kfiles.ijs
==========
This script contains definitions for a keyed file system.

main functions:
   kcreate     kcreate 'dat'              create file
   kdir        kdir 'dat'                 keyword directory
   kerase      kerase 'dat'               erase file
   kread       kread 'dat';'key'          read data for keyword
   kwrite      data kwrite 'dat';'key'    write date for keyword

 read:   if keyword not found, return '' else return value
 write:  if data='' then keyword is deleted
