The SkyCat library has a default configuration file,
which you can examine at
<http://archive.eso.org/skycat/skycat2.0.cfg>. For
some applications, it may be appropriate to use an
alternative configuration file. If so, you can point to it
using this option. For more information on SkyCat,
catalogues, and the configuration file, see the SkyCat FAQ.
Type: string; default: built-in defaults