Make Institution creatable where needed
In the rights section (supplemental data) it is possible to add an institution as rights owner (which makes sense as institutions like BGBM can have the copyright) via the search dialog. However the dialog does not allow to create a new institution, yet. Only Person or team is allowed. This is critical as we also do not have a bulkeditor to create institutions but we have a dialog to edit them.
At other place (like for Reference.institution or school (for ref type report or thesis) we have a dialog to search only for instituions and this one also allows creating institutions. However, we it is missing in the AgentBase dialog (but should not be there in the TeamOrPersonBase dialog).