doc/doxygen: move source code to code sub-directory

doc/doxygen/Makefile.am

@@ -41,13 +41,13 @@ chapters =	\
 	chapters/configure_options.doxy \
 	chapters/fdl-1.3.doxy \
 	chapters/scaling-vector-example.doxy \
-	chapters/hello_pragma2.c \
-	chapters/hello_pragma.c \
-	chapters/vector_scal_c.c \
-	chapters/vector_scal_cpu.c \
-	chapters/vector_scal_cuda.cu \
-	chapters/vector_scal_opencl.c \
-	chapters/vector_scal_opencl_codelet.cl \
+	chapters/code/hello_pragma2.c \
+	chapters/code/hello_pragma.c \
+	chapters/code/vector_scal_c.c \
+	chapters/code/vector_scal_cpu.c \
+	chapters/code/vector_scal_cuda.cu \
+	chapters/code/vector_scal_opencl.c \
+	chapters/code/vector_scal_opencl_codelet.cl \
 	chapters/api/codelet_and_tasks.doxy \
 	chapters/api/cuda_extensions.doxy \
 	chapters/api/data_interfaces.doxy \

doc/doxygen/doxygen-config.cfg.in

@@ -24,7 +24,7 @@ INPUT                  = @top_srcdir@/doc/doxygen/chapters \
 			 @top_srcdir@/starpufft/starpufft.h \
 			 @top_srcdir@/sc_hypervisor/include
 
-EXAMPLE_PATH           = @top_srcdir@/doc/doxygen/chapters
+EXAMPLE_PATH           = @top_srcdir@/doc/doxygen/chapters/code
 
 INPUT_FILTER           = @top_builddir@/doc/doxygen/starpu_doxygen_filter.sh