& btmakemechs()2
  
  Error Messages:
 
  * If the number of arguments is < 2 the function returns #-1 
    Insufficient arguments!
  * If the number of arguments is > 5 the function returns #-1 Too 
     many arguments!
  * If <Faction> is not a valid faction the function returns #-1 
    Invalid faction name!
  * if <type> is a null string the function returns #-1 Invalid type 
    bitvector!
  * if <type> is not a valid <type> the function returns #-1 NO 
    UNITS WITH FLAG <type> FOUND
  * If <tonnage> is > 4000 the function returns #-1 Max of 4000 tons 
    of mecha at once! Sowwy!
  * if <opttonnage> is < 20 the function returns #-1 Invalid 
    tonnage!
  * if <maxvariation> is < 5 the function returns #-1 Invalid 
    MaxDifference! 
 
  Example:
  Given that Draconis Combine is a valid faction with a short name of 
  DC
 
  > think btmakemechs(dc,500,1,60,10)
  CRD-3R DRG-1C DRG-1C DRG-1N DV-6M HBK-4J SHD-2K TBT-5J