New sane-backend for Avision

"Avision" provides a new sane-backend for a large number of scanners. You can download it here: ftp://ftp.avision.com.tw/pub/Driver/Others/SANE_Driver/Scanner/Avision_SANE_20210806.zip Greetings Wolfgang

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information