[issue17743] Use extended syntax of `set` command in activate.bat/deactivate.bat batch files.

[Piotr Dobrogost]

New submission from Piotr Dobrogost:

This makes it possible to handle paths/usernames with special characters - see https://github.com/pypa/virtualenv/pull/352

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components: Library (Lib)
messages: 187037
nosy: piotr.dobrogost, vinay.sajip
priority: normal
severity: normal
status: open
title: Use extended syntax of `set` command in activate.bat/deactivate.bat batch files.
type: behavior
versions: Python 3.3, Python 3.4

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue17743>
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