#427 Additional strict mode - warn

[Miroslav]

Hi,
Current options for section strict mode is on or off. It will be usefull to introduce third mode "warn" which will perform check and show where this subnet is used, just like mode "on", but wil also make possible to overrule it and add subnet ("overrule and add" button). When "overrule and add" button is used, the mail should be send to the administrators with details of new created subnet with section and existing subnets with sections.

Kind regards,
Miroslav