This includes making int("01") parse in base 10 like standard Python.
The new error message is different from cpython. It says e.g.,
`SyntaxError: invalid syntax for integer with base 0: '09'`
Signed-off-by: Jeff Epler <jepler@gmail.com>
Tests for an issue with line continuation failing in paste mode due to the
lexer only checking for \n in the "following" character position, before
next_char() has had a chance to convert \r and \r\n to \n.