[SQUASHME] Removed unused auto_init dependecy
[SQUASHME] Fixing various style problems
[SQUASHME] Reduce scope of local variables

https://travis-ci.org/RIOT-OS/RIOT/builds/36579191#L1209
[SQUASHME] Set PIDs initially to KERNEL_PID_UNDEF

Suggested by Oleg Hahm
[SQUASHME] Defined speaking names instant of magic constants.
pkg: added desvirt
[SQUASHME] Just forgotten the checks of the PIDs
[SQUASHME] clocksync: send and receiver helper fixed
[SQUASHME] clocksync: fixed code style issues
[SQUASHME] clocksync: create threads with CREATE_SLEEPING
[SQUASHME] clocksync/gtsp: replaced literals by defines
[SQUASHME] examples/clocksync: use uart0_readc/uart0_putc
[SQUASHME] clocksync/includes: added and fixed documentation
[SQUASHME] gtimer/Makefile: EOF fix for git
[SQUASHME] clocksync: applied astyle
[SQUASHME] examples/clocksync: added uart0 module Makefile dependency