* Define expected number of tests near the top.

* Define expected number of tests near the top.
* Call readfile() directly from writefile().
* Parameterize commit message for the web-commit case.
* Describe intent of test cases.
* Rename test subs to match what they actually do.
* To prove extra path slashes don't cause trouble, instead of running
  the same tests a second time, just assert that checkconfig()
  strips the slashes.