rewrite sort_UE for UL and DL and adapt the rest to the change
The previous version did not seem to work properly with several UEs. I too often ended up with a list 'next' where next[i] = i, leading to an infinite loop, crashing the processing. The sorting functions were hard to understand and too slow anyway (O(n*n)). We now use qsort_r and comparison functions, that should define the same order as the previous version. One important point is that the "next" lists and the "head" variable are now considered invalid before calling sort_UE. So all the code (coming before sort_UE) that looped using those variables has been rewritten to loop over all possible UEs and the first instruction of the loop is to exit the loop if the UE is not 'active'. There is room for improvement here. We will reintroduce a list of some kind at some point. Let's first have something that works and then optimize. Today NUMBER_OF_UE_MAX is 16, that's not a big deal. Consequently, the add_new_ue and rrc_mac_remove_ue have also been rewritten, hopefully for the better. This commit is not a basic work and may introduce some problems.
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