Returns a list of packed coordinates in the y*MapWidth+x format that satisfy the following conditions:

• The set is connected. Meaning that without walking out of the group or teleporting, you can visit all of them.
• The set is empty or contains (X,Y)
• The set is filled only with squares at height between min_height and max_height inclusive.
• There are no more than max_size squares in the set.
• If avoid_occupied is set, no square is under an object, unless that object is over (X,Y).
• If full_cells_only is set, no square is one of those triangle areas at the border of two height regions.
• No square is one of those triangle areas if the flood fill is on the low side.

:destroyed
MapWidth ->w
#Create a digitalis growth area bomb that conforms to the terrain struck,
#but avoids diagonal walls and puts growth under structures.
CurrentCoords dup2 GetTerrain dup FALSE TRUE 20 FloodFillTerrain ->list
<-list GetListCount 0 do
  #extract the coordinates
  <-list I GetListElement ->a
  <-a <-w mod ->x
  <-a <-w div ->y
  #place the digitalis
  <-x <-y TRUE SetDigitalisGrowth
loop