custom validations before standard ones #905
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This PR changes the order of the validations. The standard Django validations which were run through full_clean are now postponed after the custom ones. The reason is that the custom ones provide more refined error messages and if we run them after the standard ones the user can get an error which is not really the correct one.
This was the reason why there was one affect validation run in the save method however that was breaking the concept of the AlertMixin where there is an option to suppress the exception and only store the alert. This PR comes as a prerequisite of the orphaned tracker linking where a dummy affects will need to be automatically created and they will possibly be partially invalid due to a missing information. A non-suppressible exception is a blocker.