[IMP] crm: remove useless code

In this commit useless code is removed

  * method 'close_dialog' and 'edit_dialog' from crm.lead;
  * actions: crm_opportunity_report_action_graph,
    create_opportunity_simplified, crm_lead_action_activities,
	merge_opportunity_act;
  * views: view_create_opportunity_simplified

Indeed this is dead code and can be removed to clean a bit module.

Task 47118