& btgetrange()
 
  Syntax: btgetrange(<MapOBJ>,<arg1>,<arg2>[,<arg3>[,<arg4>[,<arg5>[,<arg6>[,<arg7>]]]]])

  This function returns the distance (in hexes) between the specified 
  objects or hexes.
 
  Arguments:
 
  * The function requires between 3 and 7 arguments. Acceptable 
  arguments are either 2 UnitDB's, 1 UnitDB and an xy[z] set, or 2 
  xy[z] sets. 
 
  Note: If you specify the z (altitude) element of one xy[z] set you 
  must specify it for both 'locations' - either with another xy[z] set 
  or implicitly with a unit.)
 
 Continued in btgetrange()2