Added niash backend.

backend/dll.conf

@@ -34,6 +34,7 @@ mustek
 #mustek_pp
 mustek_usb
 nec
+niash
 pie
 pint
 plustek

configure.in

@@ -299,7 +299,7 @@ else
           microtek2 mustek mustek_pp mustek_usb nec pie plustek \
           plustek_pp ricoh s9036 sceptre sharp \
           sp15c st400 tamarack test teco1 teco2 teco3 umax umax_pp umax1220u \
-          artec_eplus48u ma1509 ibm hp5400 u12 snapscan"
+          artec_eplus48u ma1509 ibm hp5400 u12 snapscan niash"
 
   if test "${sane_cv_use_libjpeg}" != "yes"; then
     echo "*** disabling DC210 backend (failed to find JPEG library)"