data tree FEATURE support for lists with duplicate instances

Changes mainly in diff processing.
Refs #1483
diff --git a/models/yang@2020-06-17.h b/models/yang@2020-06-17.h
deleted file mode 100644
index 4c5058e..0000000
--- a/models/yang@2020-06-17.h
+++ /dev/null
@@ -1,377 +0,0 @@
-unsigned char yang_2020_06_17_yang[] = {
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diff --git a/models/yang@2021-04-07.h b/models/yang@2021-04-07.h
new file mode 100644
index 0000000..5fbd6d8
--- /dev/null
+++ b/models/yang@2021-04-07.h
@@ -0,0 +1,443 @@
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+  0x65, 0x77, 0x20, 0x6f, 0x6e, 0x65, 0x2e, 0x22, 0x3b, 0x0a, 0x20, 0x20,
+  0x7d, 0x0a, 0x7d, 0x0a, 0x00
+};
diff --git a/models/yang@2020-06-17.yang b/models/yang@2021-04-07.yang
similarity index 72%
rename from models/yang@2020-06-17.yang
rename to models/yang@2021-04-07.yang
index 7e596b1..fafa4f2 100644
--- a/models/yang@2020-06-17.yang
+++ b/models/yang@2021-04-07.yang
@@ -19,6 +19,11 @@
      else. libyang uses this module to implement various YANG attributes
      defined in RFC 6020.";
 
+  revision 2021-04-07 {
+    description
+      "Added metadata for key-less list and state leaf-list diff.";
+  }
+
   revision 2020-06-17 {
     description
       "Added metadata for diff.";
@@ -49,7 +54,7 @@
     }
     reference "RFC7950 section 7.8.6. and section 7.7.9.";
     description
-      "In user ordered leaf-list, the attribute can be used to control
+      "In user ordered leaf-list, this attribute can be used to control
        where in the leaf-list the entry is inserted. It can be used during
        the NETCONF <edit-config> \"create\" operations to insert a new list or
        leaf-list entry, or during \"merge\" or \"replace\" operations to insert
@@ -66,7 +71,7 @@
     type string;
     reference "RFC7950 section 7.7.9.";
     description
-      "In user ordered leaf-list, the attribute must be used if the attribute
+      "In user ordered leaf-list, this attribute must be used if the attribute
        insert is used and specifies before/after which existing instance the
        new instance should be inserted.";
   }
@@ -75,11 +80,24 @@
     type string;
     reference "RFC7950 section 7.8.6.";
     description
-      "In user ordered list, the attribute must be used if the attribute
+      "In user ordered list, this attribute must be used if the attribute
        insert is used and specifies before/after which existing instance the
        new instance should be inserted.";
   }
 
+  md:annotation position {
+    type union {
+        type empty;
+        type uint32 {
+            range 1..max;
+        }
+    }
+    description
+      "In key-less list or state leaf-list, this attribute must be used if
+       the attribute insert is used and specifies the instance position
+       before/after which the new instance should be inserted.";
+  }
+
   md:annotation operation {
     type enumeration {
       enum none {
@@ -112,10 +130,10 @@
        Top-level nodes must always have an operation.
 
        User-ordered lists/leaf-lists with operation 'create' and
-       'replace' MUST also have the 'key' or 'value' metadata defined.
-       It specifies the succeeding instance. In case the value of
-       this metadata is empty, the node was created/moved on the
-       last position.
+       'replace' MUST also have the 'key', 'value', or 'position'
+       metadata defined. It specifies the preceding instance.
+       In case the value of this metadata is empty, the node was
+       created/moved on the first position.
 
        All the operations keep the meaning of edit-config operations
        with similar names but some are further restricted, meaning
@@ -131,15 +149,27 @@
   md:annotation orig-value {
     type string;
     description
-      "Previous value of a changed leaf. Alternatly, its meaning
-       is the same as \"value\" attribute but identifies the original
+      "Previous value of a changed leaf. Alternatively, its meaning
+       is the same as the \"value\" attribute but identifies the original
        leaf-list instance rather than the new one.";
   }
 
   md:annotation orig-key {
     type string;
     description
-      "Its meaning is the same as \"key\" attribute but identifies
+      "Its meaning is the same as the \"key\" attribute but identifies
+       the original list instance rather than the new one.";
+  }
+
+  md:annotation orig-position {
+    type union {
+        type empty;
+        type uint32 {
+            range 1..max;
+        }
+    }
+    description
+      "Its meaning is the same as the \"position\" attribute but identifies
        the original list instance rather than the new one.";
   }
 }