remove algorithms that where only used by dstar's dra2ba conversion

Since we just removed that conversion, those can go as well.  Yay!

* src/tests/kv.test, src/twa/twamask.cc,
src/twa/twamask.hh, src/twa/twaproxy.cc,
src/twa/twaproxy.hh, src/twaalgos/scc.cc,
src/twaalgos/scc.hh: Delete.
* src/twaalgos/Makefile.am, src/twa/Makefile.am,
src/tests/Makefile.am, src/tests/ikwiad.cc: adjust.

src/tests/Makefile.am

@@ -199,7 +199,6 @@ TESTS_twa = \
   degendet.test \
   degenid.test \
   degenlskip.test \
-  kv.test \
   randomize.test \
   lbttparse.test \
   scc.test \