Incorporating other GeShi's features

[ricardovirtudazo]

It's really cool to see that dokuwiki incorporated GeShi's syntax highlighting into its core, but it would be great if it also incorporates all other features of GeShi such as:

• enabling line numbers (http://qbnz.com/highlighter/geshi-doc.html#enabling-line-numbers)
• highlighting special lines "extra" (http://qbnz.com/highlighter/geshi-doc.html#highlighting-special-lines-extra)

to name a few.

[phy25]

Closed by #2307.