build manuals moved here from osmo-gsm-manuals.git

Moved to doc/manuals/, with full commit history, in preceding merge commit.
Now incorporate in the build system.

Build with:

$ autoreconf -fi
$ ./configure --enable-manuals
$ make

Shared files from osmo-gsm-manuals.git are found automatically if
- the repository is checked out in ../osmo-gsm-manuals; or
- if it osmo-gsm-manuals was installed with "make install"; or
- OSMO_GSM_MANUALS_DIR is set.

Related: OS#3385
Change-Id: I52b7b06fddd77c6dc272004f434e9e7651f6b349
diff --git a/doc/manuals/osmohlr-usermanual.adoc b/doc/manuals/osmohlr-usermanual.adoc
index d9a4654..7e709bd 100644
--- a/doc/manuals/osmohlr-usermanual.adoc
+++ b/doc/manuals/osmohlr-usermanual.adoc
@@ -6,31 +6,31 @@
 Neels Hofmeyr <nhofmeyr@sysmocom.de>
 
 
-include::../common/chapters/preface.adoc[]
+include::./common/chapters/preface.adoc[]
 
-include::chapters/overview.adoc[]
+include::{srcdir}/chapters/overview.adoc[]
 
-include::chapters/running.adoc[]
+include::{srcdir}/chapters/running.adoc[]
 
-include::chapters/subscribers.adoc[]
+include::{srcdir}/chapters/subscribers.adoc[]
 
-include::chapters/ussd.adoc[]
+include::{srcdir}/chapters/ussd.adoc[]
 
-include::../common/chapters/vty.adoc[]
+include::./common/chapters/vty.adoc[]
 
-include::../common/chapters/logging.adoc[]
+include::./common/chapters/logging.adoc[]
 
-include::chapters/control.adoc[]
+include::{srcdir}/chapters/control.adoc[]
 
-include::../common/chapters/control_if.adoc[]
+include::./common/chapters/control_if.adoc[]
 
-include::../common/chapters/gsup.adoc[]
+include::./common/chapters/gsup.adoc[]
 
-include::../common/chapters/port_numbers.adoc[]
+include::./common/chapters/port_numbers.adoc[]
 
-include::../common/chapters/bibliography.adoc[]
+include::./common/chapters/bibliography.adoc[]
 
-include::../common/chapters/glossary.adoc[]
+include::./common/chapters/glossary.adoc[]
 
-include::../common/chapters/gfdl.adoc[]
+include::./common/chapters/gfdl.adoc[]