To test all files in "data/" directory:

	$ perl t/test.t

To test all files in "data-dirs/" directory:

	$ perl t/test_dirs.t

To (re)generate *.html and *.tex files if appropiate:

	$ perl t/test.t update
	$ perl t/test_dirs.t update

It asks for confirmation for each file or directory, giving a diff if it exists
already.  Use with caution to not override correct expected results with
regressions.
