[texdoc] Feature-Request: List all documents and aliases

[Rüdiger Sonderfeld]

Hello,
let me first thank you for providing such a great and useful tool!

It would be very useful if there was a way to tell texdoc to list all 
available documents and aliases.  The former can be accomplished by calling

  texdoc -I --list ''

But it does not seem to list aliases and feels a bit like a hack.

The idea is, that this would make it easier to integrate texdoc into other TeX 
environments.  E.g., I'm currently thinking about rewriting the `TeX-doc' 
support in Emacs' AucTeX which already supports texdoc but relies on gathering 
potential completions itself by scanning the doc directories.

Regards,
Rüdiger