"Always" enable --trace

[willend]

With current main, a manually converted instr needs -t to actually function with a subsequent mcrun, since mcrun now always transfers a --trace value (0/1/2) to the binary instrument:

(mcstas-3.x-dev/miniconda3) tmp $ mcstas mini.instr 

-----------------------------------------------------------

Generating single GPU kernel or single CPU section layout: 

-----------------------------------------------------------

Generating GPU/CPU -DFUNNEL layout:

-----------------------------------------------------------
CFLAGS=
(mcstas-3.x-dev/miniconda3) tmp $ mcrun mini.instr 
INFO: No output directory specified (--dir)
INFO: Using directory: "mini_20250207_124409"
INFO: Using existing c-file: ./mini.c
INFO: Recompiling: ./mini.out
INFO: ===
Error: trace not enabled (mcenabletrace)
Please re-run the McStas compiler with the --trace option, or rerun the
C compiler with the MC_TRACE_ENABLED macro defined.
INFO: call to ./mini.out failed with Command './mini.out --trace=0 --ncount=1000000 --dir=mini_20250207_124409 --format=McCode --bufsiz=10000000' returned non-zero exit status 1.
Traceback (most recent call last):

vs.

mcstas mini.instr -t

-----------------------------------------------------------

Generating single GPU kernel or single CPU section layout: 

-----------------------------------------------------------

Generating GPU/CPU -DFUNNEL layout:

-----------------------------------------------------------
CFLAGS=
(mcstas-3.x-dev/miniconda3) tmp $ mcrun mini.instr 
INFO: No output directory specified (--dir)
INFO: Using directory: "mini_20250207_124521"
INFO: Using existing c-file: ./mini.c
INFO: Recompiling: ./mini.out
INFO: ===
Instrument parameters for mini (mini.instr)
Set value of instrument parameter dummy (double) [default='0']:

Since --trace is useful for almost everyone / every use, we should default to include it - and instead include a --notrace to disable it.