reconsider the space handling in the pyxrc

[wobsta]

We should abandon the space parameter in favor of a split parameter. By default it is unset, which means, PyX splits at spaces. You may set it to ";" (probably well known for Windows) or ":" (probably the "right" things for unix systems) and use that for splitting. However, the issue remains, that you need to choose yourself, as it automatically results in the character being not available as part of the content values in the lists.

This should make the whole thing way more intuitive.

[wobsta]

Alternatively, lists/multiple-values are often handled by line breaks within options. But I really dislike this solution ... would maybe accept to be outvoted, though.