Add an option to regex.escape() to not escape spaces

Issue #249 resolved
kovidgoyal created an issue

Recently, regex.escape() was changed to also escape spaces, because spaces are significant in VERBOSE patterns. However, escaping spaces is ugly when the escaped string is presented to a user for editing. Could you add another keyword argument to escape() to not escape spaces. So if the caller of escape() knows that the pattern is not going to be used with the VERBOSE flag, they can chosoe not to escape spaces.

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