Add librobotcontrol & submodule commands

Makefile

@@ -12,7 +12,14 @@ BUILDDIR      = _build
 help:
 	@$(SPHINXBUILD) -M help "$(SOURCEDIR)" "$(BUILDDIR)" $(SPHINXOPTS) $(O)
 
-.PHONY: help Makefile
+submodule:
+	git submodule update --init
+	git pull
+
+librobotcontrol:
+	cd projects/librobotcontrol/docs/ ; doxygen
+
+.PHONY: help Makefile submodule librobotcontrol
 
 # Catch-all target: route all unknown targets to Sphinx using the new
 # "make mode" option.  $(O) is meant as a shortcut for $(SPHINXOPTS).