UE_list_t is now used as a separate list. It can be e.g. used in the
scheduler to mark groups of users. The original UE_list_t is renamed to
UE_info_t to reflect that it is a container for information about UEs.

When a header is changed, all including files need to be recompiled,
too. Thus, including a header needlessly all over the place drives
compile times up without any reason.

rfsim works

an assertion fails in gnb (need to be fixed)

temporary changes for nr_ulsim. To be removed when new branch with SCF NR FAPI for PUSCH is merged in.

Actually there was a bug in FO compensation which I overlooked in last commit.

While fixing bug in PSS index calculation in 334519d1, I made changes in FO calculation as well. This is not nedeed and caused the FO to misbehave. Hence, reverting it.

As adding PTRS leads to shortening of the coded data, redudandency is removed and the performance decreases on a pure AWGN channel.
So PTRS should only be enabled if phase noise is present.