Fix integer division bug. Fixes #1
Fix integer division bug. Fixes #1

Since all divisions were automatically cast to integers by Java,
a huge number of false positives were being found.

Casting one of the division operands to a double first allows only
operations where the final result is *exactly* 66 (with no decimal
digits) to be considered a correct solution.
Andrefpvs/SixtySixSolver