CppUnit

I've begun writing unit tests using CppUnit (also hosted on SourceForge). They're located in the tests-cppunit subdirectory. Already writing the unit tests have made me tighten up a lot of things about how ::strmod::strmod::LnearExtent worked.

The nightly releases on http://www.omnifarious.org/StrMod/dl.html should have the test code in it if any of you care to look at it.

I just looked, and realized that the nightly release script hasn't worked since I upgraded to RedHat 7.3. Oops, it's been fixed now. :-)