Indexed palette bitmap export with dithering

Migrated from https://bugs.launchpad.net/inkscape/+bug/170948
Languishing from 2005-09-30 to 2015-11-10

Summary:

Gimp has a few options to use dithering and other methods for gradients. This results in smoother gradients without banding. Export to png could benefit from something similar.

Version Info:

- Inkscape Version: n/a
- Operating System: n/a
- Operating System version: n/a

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