Changing variable naming inside calculateOddPrimes()

-The previous change of boolean variable was mistaken, switch back to original boolean assignments.
-ORDMAX is the maximum reference points allowed, so renames to maximunReferencePoints.
-N is the position variable in the list of reference prime's squares, so renames to positionOfReferencePrimeSquare.
-MULT[] is the list of the squares of the reference prime numbers, so renames to listOfReferencePrimeSquare.
-ORD is the position of reference prime in the list of prime, so renames to positionOfReferencePrime.