initial import of ply-1.5

The 1.4 version of the package was provided by NONAKA Kimihiro
in PR 26344 .  (And seems to be based upon the FreeBSD port.)

Cleaned up and updated to 1.5 by me.

PLY is a Python-only implementation of the popular compiler construction
tools lex and yacc. The implementation borrows ideas from a number of
previous efforts; most notably John Aycock's SPARK toolkit. However, the
overall flavor of the implementation is more closely modeled after the C
version of lex and yacc. The other significant feature of PLY is that it
provides extensive input validation and error reporting--much more so than
other Python parsing tools.

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