Install header files that for some reason were missed.

smtk/attribute/CMakeLists.txt

@@ -116,6 +116,7 @@ set(attributeHeaders
   SearchStyle.h
   StringItem.h
   StringItemDefinition.h
+  Tag.h
   ValueItem.h
   ValueItemDefinition.h
   ValueItemDefinitionTemplate.h

smtk/common/CMakeLists.txt

@@ -31,6 +31,7 @@ set(commonHeaders
   Paths.h
   RangeDetector.h
   Registry.h
+  Singleton.h
   StringUtil.h
   TimeZone.h
   TypeName.h

smtk/operation/CMakeLists.txt

@@ -32,6 +32,7 @@ set(operationHeaders
   Operation.h
   Registrar.h
   ResourceManagerOperation.h
+  SpecificationOps.h
   XMLOperation.h
 
   groups/CreatorGroup.h