This stable release of WebGUI 7.9.13 contains fixes for 12 different bugs,
in the Thingy, ZipArchive Asset, Collaboration System attachments, Gallery,
UTF8 URLs, UTF8 RSS feeds in the Syndicated Content Asset, Calendar/Event
and the upgrade script and how it works with custom PayDrivers.

Changelog:
 - fixed #11783: Instances deleted during realtime run
 - fixed #11781: Thingy wrong retorn value from Ajax method
 - fixed #11780: fixFilenames regex needs an anchor in ZipArchive asset
 - fixed #11782: Attachments all showing duplicated first thumbnail
 - fixed #11777: Thingy search on yes no field fails
 - fixed #11787: Gallery resolutions wrongly ordered
 - fixed #11785: Article title / URL with äÄöÖüÜ (reopen #11683)
 - fixed #11799: 7.8.24->7.9.11 upgrade breaks on custom Paydrivers
 - fixed #11798: Gallery request non existent image
 - fixed #11800: Group to view for new events defaults to 'Everyone'
 - fixed #11796: Gallery Drag & Drop broken in IE 7
 - fixed #11795: Wrong display UTF8 chars in Syndicated content (#12621)