remove ancient Plex test file

Cython/Plex/test_tm.py

-import sys
-sys.stderr = sys.stdout
-
-from TransitionMaps import TransitionMap
-
-m = TransitionMap()
-print m
-
-def add(c, s):
-  print
-  print "adding", repr(c), "-->", repr(s)
-  m.add_transition(c, s)
-  print m
-  print "keys:", m.keys()
-
-add('a','alpha')
-add('e', 'eta')
-add('f', 'foo')
-add('i', 'iota')
-add('i', 'imp')
-add('eol', 'elephant')
-
-
-