exported devel/include/suitesparse as include folder because that is where the includes are after a build.
made sure that devel/include/suitesparse does exist before it gets exported
removed the list(APPEND @PROJECT_NAME@_INCLUDE_DIRS ... from suitesparse-extras.cmake.in
Merge pull request #20 from ethz-asl/fix/exportCorrectIncludeFolder

exported devel/include/suitesparse as include folder because that is whe...