Fix for ALF-786: WCM Cluster / Lucene: Searching in staging returns duplicate entries (when concurrently submtting)

- fixed duplication arising from indexing 0-1 and 0-2 against the index for near simultaneous snapshots 
- tracking has not been modified nor has index rebuild - the latest index info from the AVM index is definitive and complete - we do not have to do additional work as we do for DM

git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/HEAD/root@19898 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261

source/java/org/alfresco/repo/avm/AVMStore.java

@@ -211,6 +211,28 @@ public interface AVMStore
      */
     public List<VersionDescriptor> getVersions();
 
+    /**
+     * Get all the versions starting from the last until the version specified
+     * @param version - the version which which to end
+     * @return - the versions in descending order
+     */
+    public List<VersionDescriptor> getVersionsFrom(int version);
+    
+    /**
+     * Get all the versions after and including the one specified
+     * @param version - the version to start from
+     * @return - the versions in ascending order
+     */
+    public List<VersionDescriptor> getVersionsTo(int version);
+    
+    /**
+     * Get all versions from an including startVersion up to but NOT including endVersion 
+     * @param startVersion
+     * @param endVersion
+     * @return - the versions in ascending order
+     */
+    public List<VersionDescriptor> getVersionsBetween(int startVersion, int endVersion);
+    
     /**
      * Get the versions from between the given dates. From or to
      * may be null but not both.