The VCD traces have changed. This commit gets in synch
with current status.

as special events.

If we store all received events to a file, this dump is now
self-contained. Helps to analyze traces.

Some functions have also been factorized in the process, too much
duplication.

(Also tracer/Makefile was forgotten in previous commit, included
in this one...)

this calls clock_gettime for each active T macro, hopefully it
does not eat too much CPU

can be deactivated by commenting one line in T_defs.h

only works for 5MHz (7680 samples per TTI), one transport block
(basic FDD thing)