RouterInfo: Optimize writing to avoid extra copy;

eliminate caching previously enabled for routers with high memory limits
Log tweak on sig verify fail
DataHelper.writeLong() to write(byte) conversion
DatabaseEntry: Remove deprecated, unused setRoutingKey()

core/java/src/net/i2p/data/DatabaseEntry.java

@@ -98,6 +98,9 @@ public abstract class DatabaseEntry extends DataStructureImpl {
 
     /**
      * Returns the raw payload data, excluding the signature, to be signed by sign().
+     *
+     * Most callers should use writeBytes() or toByteArray() instead.
+     *
      * FIXME RouterInfo throws DFE and LeaseSet returns null
      * @return null on error ???????????????????????
      */
@@ -122,13 +125,6 @@ public abstract class DatabaseEntry extends DataStructureImpl {
         return _currentRoutingKey;
     }
 
-    /**
-     * @deprecated unused
-     */
-    public void setRoutingKey(Hash key) {
-        _currentRoutingKey = key;
-    }
-
     /**
      * @throws IllegalStateException if not in RouterContext
      */