Experimental parser: split and rename some files

tools/lexer_generator/test/term_test.py

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 import unittest
-from lexer_generator.action import Term
+from lexer_generator.term import Term
 
 class TermTestCase(unittest.TestCase):
 
   def test_basic(self):
 
     t = Term('a')
     self.assertEqual('a', t.name())
     self.assertEqual((), t.args())
     self.assertEqual("(a)", str(t))
     self.assertEqual(Term('a'), t)
 
     t = Term('a', 'b', 'c')
     self.assertEqual('a', t.name())
     self.assertEqual(('b', 'c'), t.args())
     self.assertEqual("(a,b,c)", str(t))
     self.assertEqual(Term('a', 'b', 'c'), t)
 
     t = Term('a', Term('b', 'c'))
     self.assertEqual('a', t.name())
     self.assertEqual((Term('b', 'c'), ), t.args())
     self.assertEqual("(a,(b,c))", str(t))
     self.assertEqual(Term('a', Term('b', 'c')), t)