Plot 1 generation plus common data-reading code.
Clean up plot1.R a bit.
Modify plot1 into a function.
Add TimeStamp to data.
Plot 2 generation.
Plot 3 generation.
Plot 4 generation.
Move some variables to globals for testing.
Add script to generate all images.
Add HTML page to compare reference vs generated images.
Adjust red and blue colors.
Add .gitignore.
Cosmetic.
Add R script to generate all images.
Only read data if it does not already exist in the environment.

This facilitates the script 'run_all.R' so that the data is only read once.
Ignore file.remove results in run_all.R.
Add generated plot?.png images.