Moved RCS, SFS and TSFS to a common standardization.R file.

Standardization techniques now use a common, more reasonable parameter list and output lists with the same attributes.

Terminology was updated to reflect changes in paper (e.g. QFA -> ITA).

RCS, SFS and TSFS can now fit additive models.

Predicted values, residuals and model fit statistics coded from scratch for all standardization models. Currently reported for RCS/SFS/TSFS.

Standardization output now includes original data (tra) and standardization settings.
Basic setup for meta-analysis.

Quick testing script.