Cell Broadcast: CBSP and CBCH scheduling support

This adds code to handle CBSP (Cell Broadcast Service Protocol)
from the CBC (Cell Broadcast Centre), as well as BSC-internal data
structures for scheduling the various SMSCB on the CBCH of each BTS.

There are currently one known shortcoming in the code: We don't yet
verify if keepalives are received within repetition period.

Change-Id: Ia0a0de862a104d0f447a5d6e56c7c83981b825c7
diff --git a/doc/manuals/osmobsc-usermanual.adoc b/doc/manuals/osmobsc-usermanual.adoc
index 766a11f..26f49da 100644
--- a/doc/manuals/osmobsc-usermanual.adoc
+++ b/doc/manuals/osmobsc-usermanual.adoc
@@ -24,6 +24,8 @@
 
 include::{srcdir}/chapters/handover.adoc[]
 
+include::{srcdir}/chapters/smscb.adoc[]
+
 include::./common/chapters/counters-overview.adoc[]
 
 include::{srcdir}/chapters/counters.adoc[]
@@ -34,8 +36,6 @@
 
 include::{srcdir}/chapters/control.adoc[]
 
-include::./common/chapters/cell-broadcast.adoc[]
-
 include::{srcdir}/chapters/osmux_bsc.adoc[]
 
 include::./common/chapters/port_numbers.adoc[]