fixed the TD, HC samplers
TP, TD, HC working for simple, but not so well on others
Merge branch 'indexExec' of https://github.com/taoyiliang/unc-quant
convergence studies on 1d problem
added graphs for convergence project
writeup for convergence
got q for each case, fixed plots
ongoing rework work.  Extra files exist in this dir; not sure how to remove them.
Working on sampler for rework, not there yet.