[IMP] l10n_es: Complete refactorisation of l10n_es, removing duplicities of the three current charts using charts inheritance. Details of the work done in this blog post (in spanish):

http://serviciosbaeza.com/blog/43-refactorizacion-de-l10n-es-para-openerp-v7
Revert "[FIX] website_crm_partner_assign infinite crawling"

This reverts commit 267cc630276be2fde2ee1ebb1aa7a5b7c282532e.
[FIX] website_crm_partner_assign: buggy url
[MERGE] website_crm_partner_assign infinite crawl buggy urls
Merge pull request #329 from pedrobaeza/master

[MERGE] l10n_es: Complete refactoring of l10n_es, courtesy of @pedrobaeza

See also:
- https://code.launchpad.net/~pedro.baeza/openobject-addons/7.0-l10n_es-refactorized/+merge/196809
- http://serviciosbaeza.com/blog/43-refactorizacion-de-l10n-es-para-openerp-v7