configuration UPDATE headers reorganized

config_new now made an internal header, server_config added to installed
ones. Includes reworked.
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 0758aa7..e20d290 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -139,8 +139,7 @@
     src/session_client_ch.h
     src/session_server.h
     src/session_server_ch.h
-    src/server_config.h
-    src/config_new.h)
+    src/server_config.h)
 
 # files to generate doxygen from
 set(doxy_files
@@ -153,7 +152,8 @@
     src/session_client.h
     src/session_client_ch.h
     src/session_server.h
-    src/session_server_ch.h)
+    src/session_server_ch.h
+    src/server_config.h)
 
 # source files to be covered by the 'format' target
 set(format_sources