N°803 - Allow display & edition of attributes on n:n relations on Portal

- Remove input when object is in view mode
- Improve form errors handling
- Prevent row selection when clicking input 
- Attach date time picker to table instead of input to prevent popup truncating (popup will be visible but not aligned on the input)

datamodels/2.x/itop-portal-base/portal/public/js/portal_form_handler.js

@@ -103,12 +103,6 @@ $(function()
 			oEvent.preventDefault();
 			var me = this;
 
-			// Prevent form submit if input in invalid state
-			// @see Bug N°803 - Allow display & edition of attributes on n:n relations on Portal
-			if($('input:invalid', this.element).length > 0){
-				return;
-			}
-
 			// EasterEgg : Vibrate on submit
 			if(window.navigator.vibrate)
 			{