Make implementation of hwtimer_spin() easier to read and understand
msp430: Fix variable usage in cc430-rtc.c

Closes #967.
Automatically remove dups in `$(USEMODULE)`
drivers: fix includes in rtc.h for MSP430

The comment and the actual guard in `rtc.h` did not match.
If (as in "implication") the MCU is an MSP, then `sys/time.h` must be
included, to have `time_t`, `struct timeval`, …

Including the header file in any case should be safe, so I dropped the
guard altogether.
Merge pull request #1073 from Kijewski/rtc-sys_time

drivers: fix includes in rtc.h for MSP430
ccnl: don't include transceiver and defaulttransceiver

This removes the duplicate include of the transceiver.
The transceiver module is a dependency of the
defaulttransceiver, so an explicite include is not needed

Follow up to #1053
Merge pull request #1082 from mehlis/ccnl-relay-transceiver-dup

ccnl: don't include transceiver and defaulttransceiver
Merge pull request #1002 from rousselk/fix-hwtimer-spin-wait

Enhance implementation of hwtimer_spin()
Merge pull request #1006 from Kijewski/issue-967

msp430: Fix variable usage in cc430-rtc.c
core: Remove `STATUS_TIMER_WAITING`

Closes #726.

The thread state `STATUS_TIMER_WAITING` is not used anymore.
This PR removes the value.
The number in `STATUS_ON_RUNQUEUE` is replaced by a reference.
Merge pull request #1058 from Kijewski/issue-726

core: Remove `STATUS_TIMER_WAITING`
ARM: fix several warnings
fixed warnings on Wformat
initialized `j` with 0
Merge pull request #1088 from mehlis/arm-warnings

ARM: fix several warnings
fixed Wformat warning
Merge pull request #1089 from BytesGalore/fix_test_cooperation_warnings

test:test_thread_cooperation fixed warnings on Wformat
Merge pull request #1090 from BytesGalore/fix_use_uninitialized_variable_warning

test:test_irq initialized `j` with 0
fixed Wformat warnings
Merge pull request #1091 from BytesGalore/fix_print_format_warning

test:test_pthread_barrier fixed Wformat warning