[docs] [issue15204] Deprecate the 'U' open mode

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Chris, you did a great job on improving the documentation (including about universal newlines). Can you help with this issue?

For the first stage should be clearly shown that "U" mode is not only should not be used in new code, but must be removed from the old code.

Stage 1 patch updated to resolve conflicts with Chris changes.

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Added file: http://bugs.python.org/file27345/deprecate-U-mode-stage1_2.patch

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<http://bugs.python.org/issue15204>
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