commit SHINY app
Log the lcfit failure mode
Add README for analysis
Add tile plot to show results of fitting adjusted model to failing cases.
Adjust srun parameters
Numerous changes and cleanups as detailed below
* make max iterations a parameter to the lcfit procedure

* lcfit_compare now writes fit points with 20 places of precision.
  Too little precision was causing problems when these points
  were later used to recreate a model.

* Lots of changes to shiny failure analysis app;
  Apply current model to currently failing nodes to see if they get better.
  Apply current model to previously successful nodes

* refactor model fitting and application of the model to branch legths.

* fix model scaling in utils.R to match the C code;
  When was previously a max is now a min