& btunitfixable()
 
  Syntax: btunitfixable(<UnitDB>)

  This function determines if a unit is 'cored' - ie unrepairable. The 
  function returns 1 if the unit is repairable, otherwise it returns 
  0.
 
  Error Messages:
 
  * If <UnitDB> is not a valid RS unit the function returns #-1 
    INVALID TARGET 
 
  Example:
  Given that #1234 is a mech which is repairable, and #2345 is a mech 
  which is unrepairable
 
  > think btunitfixable(#1234)
  1
  > think btunitfixable(#2345)
  0