This file list some things I don't want to forget. There are many possibly
much more important things to do which are not listed here because I won't
forget them.

- Params::Validate consequently
- consequently use in_error where required
- document which DOM functions have to be provided by an input object
- stricter on percentage in colors

done
----
- get rid of width/height setting via SVG::Render
- weaken some references (currently not necessary)
- document that 0 width and height are ignored (at least in topmost settings)
- remove white space from attribute values (or not?)
- Acknowledge Cairo library, Perl Cairo module, SVG
- Correct hook docu.
