first steps toward EM algorithm illustration
Initial stab
em_alg: style changes (e.g. bigger text)
em_alg: style changes (e.g. bigger text)
em_alg: use points that scatterplot() creates
Don't need panelutil.* and scatterplot.js; can point to kbroman.org/qtlcharts
em_alg: Makefile: pushing to web
em_alg: backbutton present when iter>0
em_alg: Add segments at means
em_alg: add title and legend
Add panel functions from R/qtlcharts

  - If I want to use these on biostat.wisc.edu, I need to be able to
    connect to them via https or locally, and kbroman.org (aka
    kbroman.github.io) doesn't seem to be able to use https