* Implementation of "chunked framing" according to RFC6242 for Netconf 1.1.

* First hello is 1.0 EOM framing, then successing rpc is chunked framing
  * See
    * [Netconf framing](https://github.com/clicon/clixon/issues/50), and
    * [Clixon does not switch to chunked framing after NETCONF 1.1 is negotiated](https://github.com/clicon/clixon/issues/314)
* C:
  * Moved netconf framing code from netconf application to clixon lib
* Test:
  * New expecteof_netconf and adjusted other expect scripts to handle NETCONF 1.1 framing

test/test_client.sh

@@ -2,6 +2,9 @@
 # Advanced Client api test
 # Compile and run a client
 # INSTALLFLSAGS="" 
+# Why test only over external NETCONF? ie CLIXON_CLIENT_NETCONF
+# there is also     CLIXON_CLIENT_IPC,      /* Internal IPC API, only experimental use */
+#                   CLIXON_CLIENT_SSH       /* NYI External Netconf over SSH */
 
 # Magic line must be first in script (see README.md)
 s="$_" ; . ./lib.sh || if [ "$s" = $0 ]; then exit 0; else return 0; fi
@@ -119,6 +122,7 @@ if [ "$LINKAGE" = static ]; then
 else
     COMPILE="$CC ${CFLAGS} -I/usr/local/include $cfile -o $app -L /usr/local/lib -lclixon"
 fi
+
 echo "COMPILE:$COMPILE"
 expectpart "$($COMPILE)" 0 ""