'res_partner' is not a module, it is a table. The model 'Partner' is 'res.partner'. The main module which create 'res.partner' is the module 'base'.

You can create more than one view(tree, form) for a specific model. The view are created in the xml files(example  the original views of Partner are in openerp/addons/base/res/res_partner_view.xml), see the memento openerp to know how create a view (http://anybox.fr/docs/openerp-technical-memento-0.6.5-a4/view). http://blog.openerp4you.in/2013/06/how-to-design-view-in-openerp-v7.html

If you have more than view for a model, you must define which view you want load. In the actions you can define a new entry 'ir.actions.act_window.view" to link the good view for a specific action. You can also use the "form_view_get"/"tree_view_get" in the context of a many2one.