Comment 1 for bug 171203

This should be priority 9. The format of the file is really
the most crucial part of the project to get right.
Everything else is secondary.

Without the use of viewBox, it's a wonder why the files work
in other programs at all. How does the program know how the
user units relate to the dimentions of the document? It
baffles me. viewBox makes this explicit. Explicit is good.