MultiLogReg Algorithm

[Garic152]

I have been working a bit more on the multiLogReg algorithm and wanted to share my latest progress.

The main part of the algorithm is almost done, but unfortunately we get a segfault error due to a casting problem in the `innerconvergence' loop. I have double-checked the code with the systemds version output, where I wasnt able to find any error, so the error origin must be inside this loop.

eric@daphne-container:/daphne$ ./bin/daphne scripts/algorithms/test_multilogreg.daph 
terminate called after throwing an instance of 'std::runtime_error'
  what():  InferencePass.cpp:472 -> InferencePass.cpp:169 -> InferTypesOpInterface failed with the following message [ type inference returned an unknown result type for some op, but partial inference is not allowed at this point: daphne.cast ]
    | Source file -> "/daphne/scripts/algorithms/multiLogReg.daph":121:4
    | 
121 |     while(innverconverge != 1.0) {
    |     ^~~

I have also added a small test file where this error is reproducible.