Usage: make eclipsesym (in application directory)

sys/vtimer: Fix two vtimer issues (hwtimer tick conversion).

sys: newlib: use double-lock scheme for uart ringbuffer

make: fix info-files target

aed4be33 broke this command, since the regular expressions here register
the macros that were introduced there, too. With this patch the skipping
of apps in travis works properly again.

Cortex-M CMSIS: Update CMSIS to version 4.3

vtimer: Add forward declarations of debug functions

False positive, the variable result is assigned from within inline assembly

found at www.arm.com/cmsis

or else some debug functions will not be declared.

Various warning fixes

cpu/cortexm: raised ISR stack size to safer value

256 Byte were not enough for some boards (not sure why, yet).
So go back to 512 byte as a save (and known working value).

cpu: centralized linkerscripts for Cortex-M based CPUs

drivers/hdc1000: fix hdc1000_startmeasure function

Change i2c_write_bytes to i2c_write_byte because it was
seriously wrong at this point.

make: add ccache support

cortexm: minor CFLAGS changes

cpu: Move ldscripts into separate directory

travis: get arm install packages for cortex_m3_1

Linker warnings usually means something does not get placed where it is
supposed to and the most likely result is a broken binary.
Linker warnings should be treated as serious problems with the program
and should be solved before the program is tested on actual hardware.

"implicit declaration of function 'blah'" is a symptom of a missing #include
and should be considered an error.

Less clutter inside the cpu/* directories by placing linker scripts
under cpu/*/ldscripts/CPUNAME.ld

cpu/cortexm: disabled hard floats for M4F CPUs

cpu: centralized cortex initialization and some defines

sys: bitfield.h: some fixes

core: optimize panic.c

fix typo that caused all packages to be installed when building group cortex_m3_1

cpu/samd21: remove -O0 override

Some CPUs (e.g. cortex-m based ones) define the UART0_BUFSIZE
in cpu.h. So also include this file here.