Pull Request for Issue688: Implement axisValues() for AMDataSource

This is a rather major upgrade to AMDataStore, AMDataSource, and AMAnalysisBlock that implements axisValues to help with data access of the independent axis data.  It upgrades all subclasses as best as I was able where there are hopefully no adverse side effects.  If possible, I would like all members to checkout this branch and test it to make sure there is no adverse behaviour.

This branch also __REQUIRES__ the latest version of the MPlot branch [Optimization.](https://github.com/acquaman/MPlot/tree/Optimization)