GMP used during 3 and a half years to solve MIT's LCS35

[Bernard Fabrot]

FWIW when I tested it GMP in 2015 (on a Core i5, no i7 back then) was about
8x to 10x faster than Java's BigInteger class. So calling GMP from Java was
way faster than using Java's built in BigInteger class.

I'd be curious to see what the difference was in 1999 when the problem was
set up: I'll come up with a test case / benchmark program.