alternative RLC implementation

This commit introduces an alternative RLC implementation
based on 36.322 version 8. AM and UM done, TM not done.

See openair2/LAYER2/rlc_v2/TODO for missing parts.

common/utils/T/tracer/hacks/pilot_timeplot.sh

@@ -0,0 +1,15 @@
+#!/bin/bash
+
+# use UP and DOWN arrow keys to scroll the view displayed by timeplot
+
+while read -n 1 key
+do
+  case "$key" in
+  'B' )
+    kill -SIGUSR1 `ps aux|grep timeplot|grep -v grep|grep -v sh|tr -s ' ' :|cut -f 2 -d :`
+  ;;
+  'A' )
+    kill -SIGUSR2 `ps aux|grep timeplot|grep -v grep|grep -v sh|tr -s ' ' :|cut -f 2 -d :`
+  ;;
+  esac
+done