Processes `HQP_MQQ` and `INC` are not implemented in `process_options`

Created by: scarlehoff

The process HQP_MQQ is currently being used by a number of datasets (e.g., https://github.com/NNPDF/nnpdf/blob/9777baf5a96187e3d3d17f595bdfe521c70e9eb1/nnpdf_data/nnpdf_data/new_commondata/ATLAS_TTBAR_13TEV_LJ_DIF/metadata.yaml#L22)

but it is not implemented in https://github.com/NNPDF/nnpdf/blob/master/validphys2/src/validphys/process_options.py

Also INC (used for instance in: https://github.com/NNPDF/nnpdf/blob/9777baf5a96187e3d3d17f595bdfe521c70e9eb1/nnpdf_data/nnpdf_data/new_commondata/ATLAS_TTBAR_13TEV_TOT/metadata.yaml#L20 ) should be added, otherwise the results won't probably be correct.

The exception corresponding to this issue in test_all_datasets should be removed before this is closed