Attachments cleanup

It is now possible to determine how long attachments are to be kept on the server. If this is not defined in the configuration file, then this period will be 6 months.

<service required="false">imsEngine.startUploadClean(true, '6 months')</service>

The first parameter defines whether attachments are to be moved to the web/trash directory or intermediately deleted. The second parameter determines recording storage duration.