figure-common.R updated to create major-specific web pages.
figure-common.R makes http://jan.ucc.nau.edu/~th798/retention/
figure-bipartite.R makes
figure-degree.R makes
download.graph.R creates download.graph/degree_courses.csv and download.graph/requirements.csv
download.course.R first script for one course.
download.reqs.R main script, works for all 7 programs.