Added the keyword "chi_surface" to the front-end dx.map function."
To set the chi2 surface level for the Innermost, Inner, Middle and Outer Isosurface.
task #7792: (https://gna.org/task/?7792) Make the dx.map write suggest chi surface values.
Authored by: tlinnet 2014-05-09
Parent: [r23136]
Child: [r23138]
