Unit Tests

- Updated README with suggested work.
- Removed obsolete TAP.py.
- Added 'conversion' script to check on the Perl -> Python progress.

test/conversion

@@ -0,0 +1,9 @@
+#!/bin/sh
+
+printf "C++:     %5d\n" $(ls *.t.cpp | wc -l)
+printf "Python:  %5d\n" $(grep '\bpython' *.t | wc -l)
+printf "Perl:    %5d\n" $(grep '\bperl\b' *.t | wc -l)
+echo
+printf "Feature  %5d\n" $(ls feature.*.t | wc -l)
+printf "Bug      %5d\n" $(ls {tw-,bug.}*.t | wc -l)
+