Adding median based predictions to ensembles

Bug fixing: multimodel median predictions failed

Adding support for median in multimodel's batch prediction method

Tests leftovers removed

Changing setup to ensure compatible Python and requests versions

Adding samples as File generator resources

Updating version to 3.0.1

Adding new argument to local model predict that shows next split field

Improving error message and typo

Adding doc for new arguments in local ensembles predict method and tests