doc: fix more license headers

Remove some cruft, set correct lgpl versions, update to lgpl where
this had been overlooked in the past, fix odd comment style...
Merge pull request #1624 from LudwigOrtmann/headacheheaders

doc: fix more license headers
tests: print expected duration in hwtimer_wait
Ensure hwtimer_spin() won't wait for an unreachable stop counter value
without using a costly MOD operation
Merge pull request #1625 from LudwigOrtmann/hwtimer_wait_duration

tests: print expected duration in hwtimer_wait
tests: remove need for pow,log2 in hwtimer_wait

Default to precalculated value for geometric series, so pow and log2
are not needed.
Merge pull request #1617 from rousselk/hwtimer-spin-ovf-fix

Ensure hwtimer_spin() won't wait for an unreachable stop counter value
Merge pull request #1626 from LudwigOrtmann/hwtimer_wait_fixup

tests: remove need for pow,log2 in hwtimer_wait
tests: improve calculation in hwtimer_wait

Kudos to @Kijewski
cpu - stm32f4: add support for stm32f415rg
cpu - stm32f4: added support for more channels/devices in periph impls
board - msbiot: initial import for the msbiot
tests/examples: blacklisted msbiot for some tests
licenses: added stm specific 3 clause BSD license pattern
Merge pull request #1494 from fnack/msbiot_reworked

Initial import of MSB-IoT board
cpu/stm32f1: spi_transfer_bytes proper counting.

The transferred bytes were being counted more than once because of a +=
when calling spi_transfer_byte().

This patch should also handle errors from spi_transfer_byte() better
since it is now possible to detect errors _after_ the first byte has
been successfully sent.

Signed-off-by: Joakim Gebart <joakim@gebart.se>
cpu/stm32f1: Reduce scope of ret variable in spi_transfer_bytes.

Reduced scope to inside the while loop as per comments in RIOT-OS/RIOT#1630

Signed-off-by: Joakim Gebart <joakim@gebart.se>
Merge pull request #1630 from gebart/stm32f1-spi-fix

cpu/stm32f1: spi_transfer_bytes proper counting.
sys: vtimer: add license header
Merge pull request #1634 from kaspar030/vtimer-license

sys: vtimer: add license header