generic support for Entity-Attribute-Value_model

Registered by Raphaƫl Valyi - http://www.akretion.com

look at http://en.wikipedia.org/wiki/Entity-Attribute-Value_model
EAV is slow but can bring easily some flexibility. Could be good to have it without abusing it.
Magento for instance is largely based on EAV that provide flexibility to it, while they totally abused this design in their case.

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