Improved variable type changing
Fix to Independent Samples T-Test
Added facility for reading dataset variables as factors
Added a means for analyses to produce images

Also updated Descriptives to demonstrate this feature
Multiple images can now appear on the same row
Images in results can now be resized by the user
Images now re-render after being resized

A lot of refactoring went on in this.
Fix to error reporting
Changed column names in R to be base64 encoded

R does not support spaces or special characters in data frame column
names. Base64 recodes column names without these other characters.