[ADD] view.rng: new @options attribute for field widgets
[ADD] view.rng: new @options attribute for field widgets

This attribute is supposed to be a JSON dict containing
arbitrary widget-specific options. To be ignored if the
widget or client does not support them.
MarkusTeufelberger/openobject-server,gisce/openobject-server,vnc-biz/openerp-server,splbio/openobject-server,splbio/openobject-server,MarkusTeufelberger/openobject-server,ovnicraft/openerp-server,MarkusTeufelberger/openobject-server,splbio/openobject-server,gisce/openobject-server,gisce/openobject-server,vnc-biz/openerp-server,ovnicraft/openerp-server