Add counter at BTS level And statistics at TBF/MS level.

Adds spb counters at BTS level(show bts statistics).
Adds RLC/MAC downlink control msg at ms level(show ms imsi <imsi_val>).
Adds the number of coding schemes counter for UL at TBF level.

Change-Id: Icbe4ba95e34bea89ee36f532d099db68204b7c38
diff --git a/src/gprs_ms.h b/src/gprs_ms.h
index bcc4fb3..72a86c9 100644
--- a/src/gprs_ms.h
+++ b/src/gprs_ms.h
@@ -130,6 +130,8 @@
 	void update_l1_meas(const pcu_l1_meas *meas);
 	const pcu_l1_meas* l1_meas() const {return &m_l1_meas;};
 	unsigned nack_rate_dl() const;
+	unsigned dl_ctrl_msg() const;
+	void update_dl_ctrl_msg();
 
 	/* internal use */
 	static void timeout(void *priv_);
@@ -180,6 +182,8 @@
 
 	struct gprs_codel *m_codel_state;
 	GprsCodingScheme::Mode m_mode;
+
+	unsigned m_dl_ctrl_msg;
 };
 
 inline bool GprsMs::is_idle() const
@@ -263,6 +267,16 @@
 	return m_nack_rate_dl;
 }
 
+inline unsigned GprsMs::dl_ctrl_msg() const
+{
+	return m_dl_ctrl_msg;
+}
+
+inline void GprsMs::update_dl_ctrl_msg()
+{
+	m_dl_ctrl_msg++;
+}
+
 inline uint8_t GprsMs::reserved_dl_slots() const
 {
 	return m_reserved_dl_slots;