Adding count/getImportedImageFiles() to Blitz Gateway. See #9744

This handles both original Arhived files and FS fileset files, returning Original Files in each case
Blitz image._countFilesetFiles() uses projection
Webclient uses new count/getImportedImageFiles()
Blitz image.countFilesetFiles() better exposed
webgateway original_file_paths() displayed in webclient
Improved layout of FS-paths display
Tiny UI fix - Paths text-area at least 3 lines
Merge pull request #672 from will-moore/web-fs-image-links

Web fs image links