[issue4016] improve linecache: reuse tokenize.detect_encoding() and io.open()

[STINNER Victor]

Changes by STINNER Victor <victor.stinner at haypocalc.com>:


Added file: http://bugs.python.org/file11679/tokenize_bom_utf8.patch

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue4016>
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