Expand parser syntax with option values

[Jochem Snuverink]

As discussed with Laurie. It would be nice to be able to use and print out values of options in the parser:

outerDiameter = option["outerDiameter"] + 0.1;
print, option["nturns"];

[Jochem Snuverink]

fix issue #167: expand parser syntax with option values

→ <<cset bfd722f08bac>>