Fixed DB object id leak when creating and dropping local temp tables.

h2/src/docsrc/html/changelog.html

@@ -20,7 +20,10 @@ Change Log
 <h1>Change Log</h1>
 
 <h2>Next Version (unreleased)</h2>
-<ul><li>Issue 609: the spatial index did not support NULL with update and delete operations.
+<ul><li>Pull request #4: Creating and removing temporary tables was getting
+    slower and slower over time, because an internal object id was allocated but
+    never de-allocated.
+</li><li>Issue 609: the spatial index did not support NULL with update and delete operations.
 </li><li>Pull request #2: Add external metadata type support (table type "external")
 </li><li>MS SQL Server: the CONVERT method did not work in views
     and derrived tables.