Updated rust-lpsolve crate to 1.0.1

[jk2997]

I would like to propose updating the rust-lpsolve crate from 0.1 to 1.0.1. The new version contains the methods set_timeout() and get_timeout() for impl Problem, which will allow the implementation of the trait WithTimeLimit for struct LpSolveProblem. In rust-lpsolve 1.0.1, the methods scatter_objective_function(), add_constraint(), and add_sos_constraint() no longer accept Vec and Vec types as arguments and accept &mut [f64] and &mut[i32] types instead, so the as_mut_slice() method was used to solve this issue. Also, scatter_objective_function(), set_integer(), set_bounds(), set_unbounded(), and add_constraint() now return Result<(), LpSolveError> types, so the unwrap() and is_ok() methods were used instead of assert statements for error checking.

[lovasoa]

Thanks @jk2997 !