optimize seems_utf8 (refs #4304)
encode args for resizeimg.php (refs #4304)
more verification before resizing image (refs #4304)
correct double return of search when query fail (refs #4303)
add exception in SearchDoc::join() (refs #4299, refs #4300)
also generalize exception to addGeneralFile
correct searchDoc count cache (refs #4305)
correct count for recursivesearch (refs #4195)