replace POS_F2 process with more inclusive POS_DIS
Created by: RoyStegeman
Currently only POS_F2
exists in the PROCESSES
dict in process_options.py, so POS_FLL
would need to be added as well, that this is missing is simply a bug.
Then, it doesn't make much sense to make POS_FLL
exclusive in "heaviness/flavour", while using the more inclusive definition for POS_F2
. However, they are both just DIS structure functions so there is no need to separate them by type. Because of this I introduced a single POS_DIS
(which only has to supports structure functions and not xsecs).