[Geany] Error transformer

[Laszlo Nagy]

> Ingenious solution Laslo.  I think it is worth putting on the wiki.  A
> few projects may use more than one language and compiler.  Since at
> the moment we don't want to complicate Geany for a rare use-case this
> gives a solution for those projects.
I cannot add a new page under howto-s. I don't see a "create new page" 
link or anything. I'm not familiar with docuwiki. Can you please help me 
out?

    L