support for some Python 3 (or 2.6+) syntax features (found by test_grammar.py in...

support for some Python 3 (or 2.6+) syntax features (found by test_grammar.py in Py3.1.1):
- oct/bin notation: 0o12345, 0b10101
- function annotations (only pure syntax support, not currently used)
also: allow decorators on inner functions