Generalize \defpath to a catalogue-resolving mechanism

[deyan]

What we really want in sTeX, in order to be scalable both locally and on the web, is to introduce library catalogues via \defpath commands:

\defpath{KWARCslides}{../../../slides}% add for relative path names 

Should then be used/resolved via:

\resolve{KWARCslides}

We need this both on the LaTeX and LaTeXML side

[deyan]

I am not sure how this is different from the current state - we have \KWARCslides instead of \resolve{KWARCslides} and no catalogues at the moment, but that shouldn't be too problematic wrt scaling, if we do things correctly.

[kohlhase]

I have no idea what I wanted to have there. closing.