Use submodule cmake to generate python documentation

doc/CMakeLists.txt

@@ -3,26 +3,7 @@
 #  Author: Florent Lamiraux
 #
 
-CONFIG_FILES_CMAKE(
-  sphinx/index.rst
-  sphinx/conf.py
-  )
+INCLUDE(../cmake/sphinx.cmake)
 
-ADD_CUSTOM_COMMAND(OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/html/index.html
-  COMMAND ${SPHINX_EXECUTABLE} -b html \"${CMAKE_CURRENT_BINARY_DIR}/sphinx\" \"${CMAKE_CURRENT_BINARY_DIR}/sphinx-html\"
-)
-
-ADD_CUSTOM_TARGET(documentation ALL
-  DEPENDS ${CMAKE_CURRENT_BINARY_DIR}/html/index.html)
-
-#
-# Install html documentation
-#
-
-# html files
-INSTALL(DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/sphinx-html
-  DESTINATION ${CMAKE_INSTALL_PREFIX}/share/doc/${PROJECT_NAME})
-
-# pictures
-INSTALL(DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/pictures
-  DESTINATION ${CMAKE_INSTALL_PREFIX}/share/doc/${PROJECT_NAME})
+SPHINX_SETUP_PROJECT_DOCUMENTATION()
+SPHINX_SETUP_PROJECT_DOCUMENTATION_FINALIZE()