fixing handling of ndi/first_tx in dci. commenting out corner case of missed ACK, this needs to be done better

those popped up thanks to previous commit

for DCI format 2. Temporaryly going back to the previous
version of code.
2. Enabling rate adaptation with multiple HARQ rounds.
(no change inside the rounds).

mcs1 was taken instead of mcs2 in several places.

This is done in another function.

Don't do it twice.
The logic is: if ndi changed or it's a first tx then round=0
and later: if round==0 then status=ACTIVE

Note: the dci formats 2, 2A and 1E were not checked,
this has to be done. dlsch[0] and dlsch[1] (when
applicable) must be checked somehow.

Not sure at all about this one, seemed necessary to me,
but I don't get the full logic in there.

To be refined.

This is done a bit above in the code, no need to do it twice.

I am not sure this is enough. To be refined.