Centered/footer printing for 0.8.0 RC2

Patch for centered printing for 0.8.0 RC2. This patch
gives you:

- GUI to choose to center horizontally or vertically
- GUI to choose center, left and right footer
- Prints pages centered horizontally or vertically, in
fit to page mode or in multi page mode.

It's a CVS unidiff patch. Hope it helps.

In the Holy Eucharist,
Omar