precursor to the canon_lide70 backend

left by @jrernst at http://www.juergen-ernst.de/info_sane.html

this version of the backend does not work

backend/canon_lide70.conf.in

@@ -0,0 +1,11 @@
+# Options for the canonusb backend
+
+# Autodetect the Canon CanoScan LiDE 600F
+usb 0x04a9 0x2224
+
+# Autodetect the Canon CanoScan LiDE 70
+usb 0x04a9 0x2225
+
+# device list for non-linux-systems (enable if autodetect fails):
+#/dev/scanner
+#/dev/usb/scanner0

doc/descriptions/canon_lide70.desc

@@ -0,0 +1,38 @@
+;
+; SANE Backend specification file
+;
+; It's basically emacs-lisp --- so ";" indicates comment to end of line.
+; All syntactic elements are keyword tokens, followed by a string or
+;  keyword argument, as specified.
+;
+; ":backend" *must* be specified.
+; All other information is optional (but what good is the file without it?).
+;
+
+:backend "canon_lide"             ; name of backend
+:manpage "sane-canon_lide"
+:version "0.1"                    ; version of backend
+;:status :beta
+:url "http://www.juergen-ernst.de/info_sane.html" ; backend home page
+
+:devicetype :scanner              ; start of a list of devices....
+                                  ; other types:  :stillcam, :vidcam,
+                                  ;               :meta, :api
+
+:mfg "Canon"                      ; name a manufacturer
+:url "http://www.canon.com/"
+
+:model "CanoScan LiDE 600F"       ; name models for above-specified mfg.
+:interface "USB"
+:usbid "0x04a9" "0x2224"
+:comment "Testing"
+:status :basic
+
+:model "CanoScan LiDE 70"         ; name models for above-specified mfg.
+:interface "USB"
+:usbid "0x04a9" "0x2225"
+:comment "Testing"
+:status :basic
+
+; :comment and :url specifiers are optional after :mfg, :model, :desc,
+;  and at the top-level.