Overview of changes in simple-scan 3.17.90 * Default to PDF when saving in all cases. * Always show file format options and use a combo box to fit better into dialog * Detect HP scanners and install drivers using PackageKit if found. * If SANE detects no scanners but we see USB IDs of Brother, Epson or Samsung scanners then prompt the user to go to their website to install drivers. * Use GUsb instead of GUdev. * Fix error dialogs not showing.