Catch-up with git version tags

* update debian/changelog
* update TODO-RELEASE
* add comments to Makefile.am and TODO-RELEASE to simplify the process
  in future
* add link to libtool docs to Makefile.am to simplify LIBVERSION
  maintenance

Related: OS#1861
Change-Id: I22c257e357f597519120232d742d6a61289db021
diff --git a/debian/control b/debian/control
index 468bd07..c91ce77 100644
--- a/debian/control
+++ b/debian/control
@@ -11,7 +11,7 @@
 Package: libosmocore
 Section: libs
 Architecture: any
-Depends: libosmocodec0, libosmocore7, libosmogb4, libosmogsm5, libosmovty3, libosmoctrl0, ${misc:Depends}
+Depends: libosmocodec0, libosmocore8, libosmogb4, libosmogsm7, libosmovty3, libosmoctrl0, ${misc:Depends}
 Multi-Arch: foreign
 Description: Open Source MObile COMmunications CORE library
 
@@ -22,7 +22,7 @@
 Multi-Arch: same
 Description: Osmo codec library
 
-Package: libosmocore7
+Package: libosmocore8
 Section: libs
 Architecture: any
 Depends: ${shlibs:Depends}, ${misc:Depends}
@@ -36,7 +36,7 @@
 Multi-Arch: same
 Description: Osmo GPRS GB library
 
-Package: libosmogsm5
+Package: libosmogsm7
 Section: libs
 Architecture: any
 Build-Depends: python (>= 2.7.6)