Parse negative numbers in Style

[kai-qu]

The first step here is to replace some of the parameters in the computations/objectives with negative numbers (see the sample programs in the wiki), see what breaks, and then fix the parser.

Possibly following this guide: https://www.schoolofhaskell.com/school/to-infinity-and-beyond/pick-of-the-week/parsing-floats-with-parsec#minus