Free Hero Mesh

  so automatically once the level is saved, if any changes have been made
  which might invalidate the solution (although it doesn't know for sure,
  so there are false positives). However, you can set this deliberately by
  yourself, in case you know that the solution remains valid; if you do
  set it by yourself just before saving, it will use your value rather
  than setting it automatically.

'mm' <class> <image> <misc1> <misc2> <misc3> <dir>
  Modify a MRU. Any values specified as null means no change.

'mR' <number>
  Select a relative MRU. Negative numbers move up the list, and positive
  numbers move down the list.

'mr' <number>
  Select a MRU, given the MRU number (0 to 31; the top is zero).