[avr] Removed usage of deprecated MCUSR

Since avr-libc 1.8.0 MCUSR is marked as poison as it was replaced by the
correct name MCUCSR.
Thus code still using the old MCUSR name does not compile anymore.

This commit replaces usages of former MCUSR by its new name MCUCSR and
modifies the alias fallback accordingly.
Added missing memb_free in queuebuf.c
Fix deallocation in queuebuf.c, case where QUEUEBUF_STATS is set
Remove unnecessary list_remove in ctimer.c (list_add automatically removes first)
struct queuebuf_data: swap len with data to make sure data is 32-bit aligned
struct frame802154_t: make sure dest_addr and src_addr are aligned
frame802154: move inclusion of linkaddr.h from .h to .c file
Need to have seed number included in filename, else the faillog files won't be reported at end of test
Merge pull request #863 from adamdunkels/pr/faillog-fix

Travis fix: trigger failed tests correctly
Output sha1sums of files used for simulation on fail
This helps reproducing results from the CI
Support setting the RELSTR
To build identical binaries the RELSTR must be identical, too.
Always compile verbose when running the CI
Merge pull request #821 from cmorty/pull/ci_debug

Make reproducing result from the CI easier
Merge pull request #782 from ejoerns/pull-req/avr-mcucsrfix

[avr] Removed usage of deprecated MCUSR
Merge pull request #857 from simonduq/fix-queuebuf

Added missing memb_free in queuebuf.c
Merge pull request #861 from simonduq/queuebuf-field-order

Alignment of field `data` in queuebuf
Merge pull request #860 from simonduq/frame802154-align

frame802154_t: make sure dest_addr and src_addr are aligned
Merge pull request #858 from simonduq/cleanup-ctimer

Remove unnecessary list_remove in ctimer.c (list_add automatically remov...
Fix doxygen prerequisites
Sort docdirs

Sorting docdirs is requierd to get reproducable results