Cpskin-diazotheme-retro

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- Change css navigation for LESS
[mgennart]

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- Ensure cpskin.theme is migrated to LESS before migrating this theme
[laulaz]

- Complete migration to LESS
[laulaz]

- Add missing theme parameters (harmonization)
[laulaz]

- Buildout harmonization & add omelette
[laulaz]

- Fix IMIO pypi URL
[laulaz]

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- Duplicate CSS rules for now to handle slider -> slider-a-la-une and
carousel -> carousel-a-la-une ids at the same time (16991)
[laulaz]

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- change css navigation
[mgennart]

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- Fix randomly broken html (no head, ...)
See details in http://trac.imio.be/trac/ticket/10615

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- Initial release.