When log reading exits, inuse flag should be cleared. Signed-off-by: Tw <wei.tan@intel.com>

As it is allowed to use spaces in file names set interactively through the tag since 7b1c85f, do not reject names with spaces in the 'name' ctl message either. Fixes #559.

Fixes #561.

Fixes #563.

Default builds of Firefox remove the previous X remote interface, now causing the use of -remote to silently exit and do nothing. https://hg.mozilla.org/mozilla-central/rev/ef22d8cbf4ef

All utilities print their usage message to stderr, cmp(1) and getflags(8) should do the same.

Found in Arch Linux but never reported upstream: https://bugs.archlinux.org/task/55640