Behind #define LOGGING: Correct usage of now() to replacement unix_time().
Reduce duplicate data. Add a mostly empty skeleton test.
Merge pull request #640 from FullName/logging_fixes

Behind #define LOGGING: Correct usage of now() to replacement unix_time().
Merge pull request #641 from FullName/autotests_reduce

Reduce duplicate data. Add a mostly empty skeleton test.
Merge remote-tracking branch 'upstream/master' into ID-IP-r1

Conflicts:
	auto_tests/Makefile.inc
	toxcore/Messenger.c
	toxcore/util.c
Assoc_close_nodes_find():
- fix an off-by-one in returning client indices

Assoc_client():
- check for invalid index 0 (zero)