[issue10882] Add os.sendfile()

[Giampaolo Rodola']

Giampaolo Rodola' <g.rodola at gmail.com> added the comment:

Patch in attachment removes offset and return just the number of bytes sent as an integer.
Tests and documentation are updated accordingly.

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Added file: http://bugs.python.org/file20733/sendfile_v8.patch

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