[Piglit] Move and rename tests from bugs/ to spec/ directory.

[Fabian Bieler]

Also includes some formatting fixes,

updated some comments (particularly added license comments) and

corrected value of config.supports_gl_compat_version in some cases.



Some tests were moved to different profiles in all.py (noted in commit
msg).


Otherwise no changes.





Nicolai Hähnle, Vinson Lee, Wiktor Janas: Do any of you take issue with
the addition of the MIT copyright notice?