Log Message:
py-ply: updated to 3.11

Version 3.11
------------
Fixed some minor bugs related to re flags and token order.

Added a set_lexpos() method to grammar symbols.

Mostly minor bug fixes and small code cleanups.

Version 3.10
------------
Changed grammar signature computation to not involve hashing
functions. Parts are just combined into a big string.

Fixed Issue 101: Incorrect shift-reduce conflict resolution with
precedence specifier.

PLY was incorrectly resolving shift-reduce conflicts in certain
cases.  For example, in the example/calc/calc.py example, you
could trigger it doing this:

calc > -3 - 4
1                         (correct answer should be -7)
calc >

Issue and suggested patch contributed by https://github.com/RomaVis

Version 3.9
-----------
Exposed the parser state number as the parser.state attribute
in productions and error functions. For example:

def p_somerule(p):
    '''
    rule : A B C
    '''
    print('State:', p.parser.state)

May address issue 65 (publish current state in error callback).

Fixed Issue 88. Python3 compatibility with ply/cpp.

Fixed Issue 93. Ply can crash if SyntaxError is raised inside
a production.   Not actually sure if the original implementation
worked as documented at all.  Yacc has been modified to follow
the spec as outlined in the CHANGES noted for 11/27/07 below.

Fixed Issue 97. Failure with code validation when the original
source files aren't present.   Validation step now ignores
the missing file.

Minor fixes to version numbers.