Fix a couple bugs in differential-feature-splicing.
Improvements to differential-feature-splicing.
An experiment with scaling logistic normal sigmas.
WIP on fixing sampler issues in the splicing model.
Fix the application of splice prior in the quantification sampler.
Significant fixes and improvements to the model of splicing dynamics.

  * Use "raw data analysis" for the relative splicing.
  * Correct for random variable transform.
  * Better burn-in.
  * Fix bugs.
  * Summarization routines.
  * Call differential splicing based on absolute changes in
    proportion. Rather than looking at log-ratios which is
    biased by low relative abundance transcripts.
  * Etc.