Pass around regression coefficients as a Map
Add OLS regression results to text
Fix clowny typos
Use Unicode superscripts instead of HTML

These don't change the heights of lines, and so don't introduce
annoying vertical gaps.
Fix more stupid typos
A little fiddling
Add OLS regression line to time chart
Bring "understanding this report" blather up to date
Fix mishandling of multiple reports
Improve wording
Get rid of weird legacy API carbuncle
Get rid of some unnecessary intermediate types
Mostly replace Result type with Report
Drop the Result type entirely
Drop unnecessary UNPACK pragmas
Fix bit-rotted comment
Tix fypo
Rework configuration entirely

We now use optparse-applicative to parse the command line.

We also factor configuration a bit more cleanly.
Allow user-specified benchmarking time limits