Distribute the documentation modules into each repository

After splitting, each documentation will have to provide its own
documentation modules.

CMakeLists.txt

@@ -45,6 +45,7 @@ include_directories(${CMAKE_CURRENT_BINARY_DIR})
 configure_file(config-workspace.h.cmake ${CMAKE_CURRENT_BINARY_DIR}/config-workspace.h)
 
 add_subdirectory( gui )
+add_subdirectory( doc )
 add_subdirectory( pics )
 add_subdirectory( example )
 

doc/CMakeLists.txt

+########### install files ###############
+#
+#
+kdoctools_create_handbook(index.docbook INSTALL_DESTINATION ${HTML_INSTALL_DIR}/en)