Add @Deprecated annotation to deprecated methods

This eliminates compiler warnings on methods that previously only had
the @deprecated javadoc tag.

osmosis-apidb/src/main/java/org/openstreetmap/osmosis/apidb/common/DatabaseContext.java

@@ -451,6 +451,7 @@ public class DatabaseContext implements AutoCloseable {
      * 
      * @deprecated Use {@link #close()} instead.
      */
+    @Deprecated
     public void release() {
     	close();
     }

osmosis-apidb/src/main/java/org/openstreetmap/osmosis/apidb/common/DatabaseContext2.java

@@ -279,6 +279,7 @@ public class DatabaseContext2 implements AutoCloseable {
      * 
      * @deprecated Use {@link #close()} instead.
      */
+	@Deprecated
     public void release() {
     	close();
     }