StochCP algorithm is missing from the repository

Trying to import proxtoolbox on the master branch currently fails with

ModuleNotFoundError: No module named 'proxtoolbox.algorithms.StochCP'

proxtoolbox/algorithms/__init__.py tries to reexport the StochCP algorithm, but the file is missing. The issue can be worked around by commenting out the line, but presumably the algorithm is actually intended to be included in the repository.