Continued improvements to html_plot output: relative info in plot tooltips, angled X-axis tick labels, undef rate protection, skip empty chart with --compare
Use a linear X axis when plotting linear-scaled tests, like rc-man-or-boy-test
Increase minimum run time for scalable tests to 3.0 seconds
Properly handle linear-scaled tests in timeall
Properly skip tests that aren't enabled
Factor mini-benchmark definitions out of timeall into minibenchmarks.pl; change default size of rc-forest-fire map from 30x20 to 16x16