Improve install include directory layout

CMakeLists.txt

@@ -110,7 +110,7 @@ if (ITA_CONVOLUTION_WITH_NUPCONV)
 endif ()
 
 target_include_directories (
-	${PROJECT_NAME} PUBLIC $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include> $<INSTALL_INTERFACE:INCLUDE_PATH>
+	${PROJECT_NAME} PUBLIC $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include> $<INSTALL_INTERFACE:INCLUDE_PATH/ITAConvolution>
 )
 
 target_link_libraries (${PROJECT_NAME} PUBLIC ITABase::ITABase ITAFFT::ITAFFT TBB::tbb)
@@ -130,7 +130,7 @@ packageProject (
 	VERSION ${PROJECT_VERSION}
 	BINARY_DIR ${PROJECT_BINARY_DIR}
 	INCLUDE_DIR ${PROJECT_SOURCE_DIR}/include
-	INCLUDE_DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
+	INCLUDE_DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/ITAConvolution
 	DEPENDENCIES "ITABase;ITAFFT;TBB"
 	COMPATIBILITY ExactVersion
 	NAMESPACE ${PROJECT_NAME}