Update mac addresses list
fix sporadic segfault when scanning for hosts
fix race condition while scanning for hosts
Unlock the mutex if the scan is interrupted
Unlocking some more MUTEX
unify SCAN_LOCK thread lock
add some explanation to the new SCAN_LOCK macro
enable threading for host scanning in Curses UI
match the correct name for the UI thread
Add an INSTANT_USER_MSG in case of ipv6 probe cancelled
Remove some ret on SCAN_UNLOCK
Typo fix
Revert "Remove some ret on SCAN_UNLOCK"

This reverts commit 2ddffc2ea3497bf4716c0d5551b5aae7f0c2b39d.
Trying to revert to ca179dd6104b14053cec1a33b3b49959b3356357
Try to explain what has been done with SCAN{,UI}_{LOCK,UNLOCK}
libresolv built in libc on FreeBSD implementing dn_expand
fix when determine MTU on BSD system