[ADD] ability to close an opened group, fix disposal of list (don't blow up if already disposed of), improve disposal of group body elements
[ADD] ability to close an opened group, fix disposal of list (don't blow up if already disposed of), improve disposal of group body elements

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extra : convert_revision : xmo%40openerp.com-20110520133045-gc7cvv7594872cgq

vnc-biz/openerp-web,MarkusTeufelberger/openerp-web,splbio/openerp-web,vnc-biz/openerp-web,gisce/openerp-web,splbio/openerp-web,MarkusTeufelberger/openerp-web,splbio/openerp-web,gisce/openerp-web,vnc-biz/openerp-web,MarkusTeufelberger/openerp-web,vnc-biz/openerp-web,gisce/openerp-web