minor patches for cpplint

[GoogleCodeExporter]

minor fixes, more explanation inside the patch messages. In short, these 
provide:
- minor fixes
- py3k compatibility
- more default extensions
- some tests more robust

Original issue reported on code.google.com by thibault...@comsysto.com on 4 Jan 2015 at 1:29

Attachments:

• 0001-call-python-via-env.patch
• 0002-more-extensions-and-fix-check.patch
• 0003-header-check-by-first-extension-char.patch
• 0004-py3k-compatible.patch
• 0005-Allow-numbers-in-Header-guards-names-and-macros.patch
• 0006-Run-header-test-with-temporary-folder-and-file.patch