Implement IuCS (large refactoring and addition)

osmo-nitb becomes osmo-msc
add DIUCS debug log constant
add iucs.[hc]
add msc vty, remove nitb vty
add libiudummy, to avoid linking Iu deps in tests
Use new msc_tx_dtap() instead of gsm0808_submit_dtap()
libmgcp: add mgcpgw client API
bridge calls via mgcpgw

Enable MSC specific CTRL commands, bsc_base_ctrl_cmds_install() still needs to
be split up.

Change-Id: I5b5b6a9678b458affa86800afb1ec726e66eed88
diff --git a/include/openbsc/Makefile.am b/include/openbsc/Makefile.am
index 1dfe6c3..2558d7c 100644
--- a/include/openbsc/Makefile.am
+++ b/include/openbsc/Makefile.am
@@ -14,6 +14,7 @@
 	bss.h \
 	bts_ipaccess_nanobts_omlattr.h \
 	chan_alloc.h \
+	common.h \
 	common_bsc.h \
 	common_cs.h \
 	crc24.h \
@@ -46,11 +47,14 @@
 	handover_decision.h \
 	ipaccess.h \
 	iu.h \
+	iucs.h \
+	iucs_ranap.h \
 	meas_feed.h \
 	meas_rep.h \
 	mgcp.h \
 	mgcp_internal.h \
 	mgcp_transcode.h \
+	mgcpgw_client.h \
 	misdn.h \
 	mncc.h \
 	mncc_int.h \