Comment 49 for bug 168164

Further commit to trunk r11616
* Add an option to "always output in px" (default is off)
* Size of preview text in Font dialog should (better) match the canvas at 100% (previously we used px instead of pt)

So the current state is :

a) Inkscape uses px and 72dpi for all text transforms/calculations etc internally
b) Users can choose their preferred unit "for display" in the UI (default is points). These units are basically converted to and form px "on the fly" as needed.
c) Users can choose to output to file in preferred unit (b) or always px (default is users preferred unit)

Questions :
1. Should "always output in px" be default on ?
2. Would it make sense to have dpi configurable per document ?
3. Whats the best way to make viewBox more easily useable ?