dimacs 0.2.0

Utilities to parse files in DIMACS .cnf or .sat format which is useful for participating in the DIMACS SAT solver competitions.
Documentation
TODO List for DIMACS Parser
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 - add checks for enhanced errors (`fn parse_safe_dimacs`)
 - maybe add other DIMACS formats (e.g. edge)
 - add some benchmarks testing performance of the new parsing facility
 - add some other parser and lexer tests
 - add fuzz testing
 - add macro to easily create static formulas