Non-interactive use of regression script

[fbrausse]

Currently, on master, the only way for me to run the regression test script non-interactively, the way I would expect the default to be, is the following:

$ yes n | ./smlp_regr.py -g -w 16 -n -def N

From the help message I would have thought that either of the switches -n and -def N would disable questions to the user, but that is not the case, hence piping in yes n into the command is necessary.

[fbrausse]

Also the help message for -g reads "Answer no on all replacing.", which appears to be wrong.