pull down stack size another 128k, make the sql use mem cache and add session count to the status command

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@2747 d0543943-73ff-0310-b7d9-9358b9ac24b2

src/include/switch_core.h

@@ -360,6 +360,12 @@ SWITCH_DECLARE(switch_core_session_t *) switch_core_session_request(const switch
 */
 SWITCH_DECLARE(void) switch_core_session_destroy(switch_core_session_t **session);
 
+/*! 
+  \brief Provide the total number of sessions
+  \return the total number of allocated sessions
+*/
+SWITCH_DECLARE(uint32_t) switch_core_session_count(void);
+
 /*! 
   \brief Allocate and return a new session from the core based on a given endpoint module name
   \param endpoint_name the name of the endpoint module