Issue of resources modifications

Several changes has been introduced to ensure better control over issuing of resources. The resource mode, from the Guestbook module, is extended with new columns, e.g., informing about the planned return of resource date. There is also be a possibility of adding notes to the resources and placing a badge number. Moreover, the system will automatically send e-mail reminders about the planned return of the resource. There has been added an option to block the resource for a selected person and to enter a host while the resource is being issued.