Fixes #1104, alternative to #1178.

Add `|| exit 1` to all constructs like `@for i in $(DIRS) ; do "$(MAKE)" -C $$i ; done ;`, so that compilation stops on the first error.

* updated Makefilde dep, add the gpioint dependency to use cc110x on MSBA2
board
* updated CFLAGS Variable

This way make clean runs more... cleanly

* introduced variable for cpu folder

* included a more convenient approach to organize Makefiles

* updated some makefiles and fixed includes for msb430h

* fixed some prototypes
* restructured sys