Allow execution of static tests with the `make static-tests`
command and improve its output for the human reader

HTML will be build per default.

distclean
removes all build products, also depends on docclean

clean
removes all build products for the current board

also, silence clean target from Makefile.include and let it ignore errors

Almost everything was build sequentially in RIOT, because we employed
explicit for-loops to build directories (DIRS). This PR makes our make
system use normal dependencies to build directories.

All our compiling rules were duplicated, once for the application, once
for modules. This PR makes the application a normal module, removing
this duplication.

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