usage: mask2full [-i file][-o file]
     where: -i file - for input <file>
     where: -o file - for output <file>
     where: -m n - to multiply resolution by digit n
     where: -d n - to divide resolution by digit n

  this utility converts +Grid_mask to +Grid_full
    and back again for quick and dirty edits

                   mask      full
           land  :  z   <->   0
          ocean  :  w   <->   1
 interior corners:  x   <->   2
          sponge :  s   <->   3
   surface relax :  t   <->   4  (only used with PBL)
   sponge+surface:  b   <->   5           "
   repeat line   :  r   <->   no equivalent