Add an ID range for KGCL-mediated changes. (#2522)

This commit adds a new ID range intended for classes created by Ontobot
using the KGCL language.

This will allow editors to command the creation of new classes directly
from within a GitHub ticket, without having to explicitly specify the ID
of the class to be created:

  create class AUTOID:1 'my new class'
  create edge AUTOID:1 rdfs:subClassOf CL:9999
  create exact synonym 'my synonym' for AUTOID:1

The ROBOT KGCL plugin would then automatically create the new class
using an ID picked from within the "KGCL" range.

src/ontology/cl-idranges.owl

@@ -485,4 +485,10 @@ Datatype: idrange:71
     Annotations:
         allocatedto: "Caroline Eastwood"
     EquivalentTo:
-        xsd:integer[>4052000, <= 4059999]
+        xsd:integer[>4052000, <= 4059999]
+
+Datatype: idrange:72
+    Annotations:
+        allocatedto: "KGCL"
+    EquivalentTo:
+        xsd:integer[>4060000, <= 4069999]