i3bar Bugfix: don't show "EOF" status line error

When the `status_command` sends EOF, it is terminated. Terminating this
process prints an error message to the status line (hence, a race
condition). This error message is always more useful than the former
"EOF" status line error because it shows the exit code.
Merge branch 'fix-eof-msg'
Merge branch 'master' into next
Bugfix: `move <direction>` sends workspace focus

Make sure the command `move <direction>` properly sends the workspace
focus ipc event required for i3bar to be properly updated and redrawn.

Make `ipc_send_workspace_focus_event publicly available from ipc.h for
more flexible event sending.
Merge branch 'fix-move-focus'
Merge branch 'master' into next
Respect Motif hint for window decorations

When the _MOTIF_WM_HINTS property of a window specifies it should have
no title bar, or no decorations at all, respond by setting the border
style of that container to BS_PIXEL or BS_NONE respectively.

This comes from the old Motif window manager. It was originally intended
to specify exactly what sort of decorations a window should have, and
exactly what sort of user input it should respond to. The EWMH spec
intended to replace Motif hints with _NET_WM_WINDOW_TYPE, but it is
still in use by popular widget toolkits such as GTK+ and Java AWT.

i3's implementation simply mirrors Gnome's Metacity. Official
documentation of this hint is nowhere to be found.

For more information see:
https://people.gnome.org/~tthurman/docs/metacity/xprops_8h-source.html
http://stackoverflow.com/questions/13787553/detect-if-a-x11-window-has-decorations

fixes #832
docs/i3bar-protocol: add missing newline