Reformatted scatterplot params documentatino to match HistHiLite.js
Add documentation on the different input data types for scatterplot,
including to-be-implemented types.
Fix bug in stat_utils.js where random numbers could not be generated
because they were attempting to be generated by using the Java API and
not Javascript.
Fix bug in stat_utils.js - incorrect constant in cNormPoints. Now the
constant matches what is in the Java version.