adding in fsig command (not parsing yet). See example test_fsig.py in bin folder. Also made component variable an optional argument for xaxis and x2axis which will break previous scripts. Did this as when setting the parameter to tune, the Param object contains whatever component owns that parameter so no need to pass it twice. Also stops someone passing a parameter not for the component stated.

adding in output selection support when noxaxis command is present, can end up with a 0-D array if one output and noxaxis is used, which is odd..

Only thing missing really is the arxiv link to the document.

wz -> w for gaussian parameters.

an error I would prefer to just print that and exit(1).

which might work better for thermal lens part.

in older revisions of scipy.

added proper formatting to the gauss parameters i.e.
{.15g}, probably need to do that for many other params as well.