Addition of IOExerciser, a simple module for emulating various IO
patterns.
Fixes based on github review from Giulio and Chris.

- Move the plugin to IOPool/Input test directory.
- Remove CVS-specific $Id$.
Correct documentation example.

This is an OutputModule, not an EDAnalyzer.
Merge pull request #320 from bbockelm/ioexerciser

Addition of IOExerciser, a simple module for emulating various IO patterns