Initial support for stereo codecs, and added L16 codecs. Also better handling for case remote media is restarted

git-svn-id: https://svn.pjsip.org/repos/pjproject/trunk@411 74dad513-b988-da41-8d7b-12977e46ad98
diff --git a/pjmedia/include/pjmedia-codec/config.h b/pjmedia/include/pjmedia-codec/config.h
index a9cdbfa..2006528 100644
--- a/pjmedia/include/pjmedia-codec/config.h
+++ b/pjmedia/include/pjmedia-codec/config.h
@@ -23,6 +23,14 @@
 
 
 /**
+ * Unless specified otherwise, L16 codec is included by default.
+ */
+#ifndef PJMEDIA_HAS_L16_CODEC
+#   define PJMEDIA_HAS_L16_CODEC    1
+#endif
+
+
+/**
  * Unless specified otherwise, GSM codec is included by default.
  */
 #ifndef PJMEDIA_HAS_GSM_CODEC