- While I'm here:
  - Shorten COMMENT
  - Use . for COPYTREE_SHARE

An enumeration is a set of symbolic names (members) bound to unique, constant
values. Within an enumeration, the members can be compared by identity, and
the enumeration itself can be iterated over.

WWW: https://pypi.python.org/pypi/enum34

PR:		ports/189073
Submitted by:	Muhammad Moinur Rahman <5u623l20@gmail.com>