[issue20295] imghdr add openexr support

[Martin Vignali]

New submission from Martin Vignali:

Add support for detect openexr file (http://www.openexr.com/)
Based on information provided by :  http://www.openexr.com/ReadingAndWritingImageFiles.pdf

I make some tests, on different kind of exr file, to check, the new function.

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components: Library (Lib)
files: img_hdr_exr.patch
keywords: patch
messages: 208409
nosy: mvignali
priority: normal
severity: normal
status: open
title: imghdr add openexr support
type: enhancement
versions: Python 3.4
Added file: http://bugs.python.org/file33531/img_hdr_exr.patch

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<http://bugs.python.org/issue20295>
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