added timex_uint64 function
cc1100_phy.c: fix usage of timex_t
cc1100-csmaca-mac.c: fix usage of timex_t
flowcontrol.c: fix usage of timex_t
lowpan.c: fix usage of timex_t
destiny.c: fix usage of timex_t
tcp_timer.c: fix usage of timex_t
socket.c: fix usage of timex_t
added timex_isnormalized
fix debug msg
fix pre-init

set the internal relative time - don't rely on hwtimer_now() being
called externally
add comment

addresses https://github.com/RIOT-OS/RIOT/pull/501#discussion_r8881054
update internal timer on hwtimer_arch_set
reduce HWTIMERMINOFFSET
Merge pull request #457 from mehlis/vtimer-now-followup

fix usage of vtimer_now
Merge pull request #501 from LudwigOrtmann/native_hwtimer_fixup

Native hwtimer fixup