las3_pub / simso

class is the module name containing the scheduler class.
className is still the path of the module.

className is ignored when class is provided.

Now gives the highest priority to the k-1 first tasks
instead of the k first. Thanks Joeri Biermans.

This fixes the following use case:
at t=x, T migrates from CPU1 to CPU2
at t=x, T finally migrates from CPU2 to CPU1

This was leading to a situation where T was running on both processors.

Results for the literature example now match with the schedulers implementation.
Note: sympy is used to improve numeric stability.