Instead of muting all compiler and other binutils output by default,
introduce a variable to make this behaviour configurable.

* do not overwrite CFLAGS in boards Makefile

the target runs make for every board in boards

Fixes bug in build-system that does not allow you to use other
PROJBINDIR than $(CURDIR)/bin

This enables issues like https://github.com/RIOT-OS/projects/issues/26
to be fixed.

at86rf231 TX and RX

driver is using vtimer instead of hwtimer_ functions, TO CHECK

vtimer debug function prototype fix

The following variables are included in various Makefiles but never
defined.

    $(BOARDINCLUDE)
    $(PROJECTINCLUDE)
    $(CPUINCLUDE)

All files, which used by chronos board were edited according to new texas instruments headers, all warnings fixed

* introduced variable for cpu folder