Added method to retrieve engine's default tick sleep interval.

git-svn-id: http://voip.null.ro/svn/yate@2303 acf43c95-373e-0410-b603-e72c3f656dc1

libs/ysig/yatesig.h

@@ -701,6 +701,13 @@ public:
      */
     unsigned long tickSleep(unsigned long usec = 1000000);
 
+    /**
+     * Get the default engine tick sleep time in microseconds
+     * @return Default timer sleep in usec
+     */
+    inline unsigned long tickDefault() const
+	{ return m_usecSleep; }
+
     /**
      * Helper template used to remove a component descendant from its engine,
      *  destroy it and set the received pointer to 0