* AppContext: Add hasWrapper() method

* Shutdown:
    - Clear more resources in peer manager, netdb, stat manager,
      session key manager, naming service, tunnel dispatcher,
      OCMOSJ (result of testing with jvisualvm)
    - Don't call wrapper on shutdown (starting two threads) if we
      were started with runplain

core/java/src/net/i2p/I2PAppContext.java

@@ -888,4 +888,12 @@ public class I2PAppContext {
     public InternalClientManager internalClientManager() {
         return null;
     }
+
+    /**
+     *  Is the wrapper present?
+     *  @since 0.8.8
+     */
+    public boolean hasWrapper() {
+        return System.getProperty("wrapper.version") != null;
+    }
 }

core/java/src/net/i2p/client/naming/BlockfileNamingService.java

@@ -108,7 +108,7 @@ public class BlockfileNamingService extends DummyNamingService {
      *
      *  If not in router context, the database will be opened read-only
      *  unless the property i2p.naming.blockfile.writeInAppContext is true.
-     *  Not designed for simultaneous access by multiple processes.
+     *  Not designed for multiple instantiations or simultaneous use by multple JVMs.
      *
      *  @throws RuntimeException on fatal error
      */
@@ -780,6 +780,7 @@ public class BlockfileNamingService extends DummyNamingService {
             }
             _isClosed = true;
         }
+        clearCache();
     }
 
     /** for logging errors in the static serializers below */

core/java/src/net/i2p/stat/StatManager.java

@@ -57,6 +57,12 @@ public class StatManager {
             _statLog = new BufferedStatLog(context);
     }
     
+    /** @since 0.8.8 */
+    public void shutdown() {
+        _frequencyStats.clear();
+        _rateStats.clear();
+    }
+
     /** may be null */
     public StatLog getStatLog() { return _statLog; }
     public void setStatLog(StatLog log) { 

core/java/src/net/i2p/util/LogConsoleBuffer.java

@@ -77,4 +77,12 @@ public class LogConsoleBuffer {
     public List<String> getMostRecentCriticalMessages() {
             return new ArrayList(_critBuffer);
     }
+
+    /**
+     *  @since 0.8.8
+     */
+    public void clear() {
+        _buffer.clear();
+        _critBuffer.clear();
+    }
 }

core/java/src/net/i2p/util/LogManager.java

@@ -660,6 +660,10 @@ public class LogManager {
                 _writer.notifyAll();
             }
         }
+        _records.clear();
+        _limits.clear();
+        _logs.clear();
+        _consoleBuffer.clear();
     }
 
     private static int __id = 0;