[DGD] sprintf plugin for gurbalib

[bart at wotf.org]

Since current Gurbalib no longer includes this in any distribution, I made a
new package of the sprintf plugin.

It can be found at http://wotf.org/downloads/gurba/plugins/sprintf-1.1.2.tar.gz

This is a GPL licensed package so it can not be included as a regular part of
Gurbalib. I'm not the original author of it, I merely fixed a number of things
and changed it slightly so it is easy to integrate with Gurbalib.

Bart.
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