#4 Hardcoded classname prefix for StatisticFactory

[Stephen C. Upton]

In the oldmcdata.analyzers.utils.stats.StatisticFactory class, the fully qualified class name for the Statistic instance is hard coded with a prefix of "oldmcdata.analyzers.utils." The current set of statistics has been moved to the oldmcdata.analyzers.utils.stats package. However, to really fix this, the full classname should be specified by the user, or have a portion of the config file set to allow these mappings.