Latency calculation in LP-scheduling

Currently in `src/model/dfcir/lib/dfcir/passes/DFCIRLinearSchedulerPass.cpp` the calculation of module's latency calculation is disabled (explicitly set to 0).

The calculation process should be included in the linear programming problem being solved.
Currently due to errors with `lpsolve` for most of the designs there is no way to check that the proposed latency calculation is correct.