Pretty output and final debugging (JobID)

Output to both log and console is now a bit prettier and meaningful. The
Job ID was not always reliably detected, sometimes we got back a string
with the location of the log-file folder. The script now looks if the
number it gets back is an 'int', otherwise it breaks the script and
let's the user retry. Cause of the problem is unknown, also to Fede :)
We also need flats!

We cannot directly go from cprs to recs, we need fltps. Thus copying a
whole block inbetween, where flats are calculated. Unfortunately this
still does not work, even when Fede helps me to debug the command-line
calls. Escalating it to Alain.
Changing description of options, introducing new "SlicesAround" option
and renaming "Range" to "Magnitude", which seems better.
Further debugging and (hopefully final) corrections

Correcting typo which hindered reconstructions to be calculated, I
forgot to add the slice number to the location of the fltp folder...
Alain suggested to slice to ROI to an even number of files, this seems
to help with the script running through all of the tasks.
Save the commandline call to the Logfile, this can help with debugging.
Nicer job-names and nicer output to the console all-around.