* Always send checkin notifications to users
This fixes the routing of the notifications, to only send „checkin“ emails if the „mail on checkin“ flag on the category was set. (and we checkout to a user with a non-empty email)
* Fixes checkout notification routing
Notifications to users should be send if the category of the resource (accessory/asset/consumable/license):
a) requires the user to confirm acceptance
b) should send notifications on checkin/checkout
* adds a check for EULAs
Adds back a check for the EULA, since the user should receive the EULA if it was set (regardless of other setings on the category, etc)
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