add ID information for Avision AV186+ and AV188 sheetfed USB scanners

backend/avision.c: add AV186+ as 'good',
                       AV188 as 'untested'
doc/descriptions/avision.desc: add AV186+ as 'good',
                                   AV188 as 'untested'

backend/avision.c

@@ -302,6 +302,24 @@ static Avision_HWEntry Avision_Device_List [] =
     /* comment="duplex! sheetfed scanner" */
     /* status="complete" */
 
+    { NULL, NULL,
+      0x0638, 0x1A33,
+      "Avision", "AV186+",
+      AV_INT_BUTTON | AV_CANCEL_BUTTON | AV_USE_GRAY_FILTER,
+      { 0, {0, 0}, {{0, 0}, {0, 0}} }
+    },
+    /* comment="duplex! sheetfed scanner" */
+    /* status="good" */
+
+    { NULL, NULL,
+      0x0638, 0x2AD9,
+      "Avision", "AV188",
+      AV_INT_BUTTON | AV_CANCEL_BUTTON | AV_USE_GRAY_FILTER,
+      { 0, {0, 0}, {{0, 0}, {0, 0}} }
+    },
+    /* comment="duplex! sheetfed scanner" */
+    /* status="untested" */
+
     { NULL, NULL,
       0x0638, 0x0A2C,
       "Avision", "AV220+",

doc/descriptions/avision.desc

@@ -89,6 +89,18 @@
 :comment "sheetfed scanner"
 :status :complete
 
+:model "AV186+"
+:interface "USB"
+:usbid "0x0638" "0x1a33"
+:comment "sheetfed scanner"
+:status :good
+
+:model "AV188"
+:interface "USB"
+:usbid "0x0638" "0x2ad9"
+:comment "sheetfed scanner"
+:status :untested
+
 :model "AV210D2+"
 :interface "USB"
 :usbid "0x0638" "0x1a35"