WIP Python-2.6 but don't remove opcodes

The scheme for turning 2.6 bytecode into 2.7 psuedo bytecode
I think is a lose.

I won't work for fragment handling.

Instead, change the grammar and syntax rules

This also has the benefits:

* We see how code generation changed over releases
  by looking at grammar and semantic rules rather
  than arbitrary code
* We can better assocate with what's running
  (in a sense this is a restatement of broken fragment
   handling)
* With the right structure in place we are in a better position to
  handle 2.5, 2.4, etc. That is, after a while, the incremental changes
  to get say from python 2.3 bytecode to python 2.7 are great.

Conflicts:
	uncompyle6/parsers/astnode.py

uncompyle6/parsers/parse27.py

@@ -0,0 +1,40 @@
+from uncompyle6.parser import PythonParserSingle
+from spark_parser import DEFAULT_DEBUG as PARSER_DEFAULT_DEBUG
+from uncompyle6.parsers.parse2 import Python2Parser
+
+class Python27Parser(Python2Parser):
+
+    def __init__(self, debug_parser=PARSER_DEFAULT_DEBUG):
+        super(Python27Parser, self).__init__(debug_parser)
+        self.customized = {}
+
+    def p_try27(self, args):
+        """
+        trystmt      ::= SETUP_EXCEPT suite_stmts_opt POP_BLOCK
+                         try_middle COME_FROM
+
+        try_middle   ::= JUMP_FORWARD COME_FROM except_stmts
+                         END_FINALLY COME_FROM
+        try_middle   ::= jmp_abs COME_FROM except_stmts
+                         END_FINALLY
+
+        except_cond1 ::= DUP_TOP expr COMPARE_OP
+                         jmp_false POP_TOP POP_TOP POP_TOP
+
+        except_cond2 ::= DUP_TOP expr COMPARE_OP
+                         jmp_false POP_TOP designator POP_TOP
+        """
+
+    def p_misc27(self, args):
+        """
+        assert        ::= assert_expr jmp_true LOAD_ASSERT RAISE_VARARGS_1
+        _ifstmts_jump ::= c_stmts_opt JUMP_FORWARD COME_FROM
+        """
+
+class Python26ParserSingle(Python2Parser, PythonParserSingle):
+    pass
+
+if __name__ == '__main__':
+    # Check grammar
+    p = Python27Parser()
+    p.checkGrammar()