Use SIGCHLD handler from dwm

Fixes #46.

make this marginally less ugly

wlr_session_change_vt is NULL safe

_net_wm not needed outside xwayland

Merge pull request #37 from alex-courtis/31-independents-mouse-focus

31 independents mouse focus

Merge pull request #41 from guidocella/declare-commitnotify

Declare commitnotify

Declare commitnotify

Merge branch 'master' into 31-independents-mouse-focus

make XWayland support optional

#31 independents retain focus while mouse is over them

#31 independents retain focus while mouse is over them

#31 independents retain focus while mouse is over them

#31 independents retain focus while mouse is over them

add monocle layout

condense getatom and add note about error return

Merge branch 'master' of github:djpohly/dwl into master

Merge pull request #25 from geistesk/error-maybe-uninitialized

getatom: fix potential uninitialized atom variable

add some more hands-off protocols

fix an editing mistake

focusclient checks whether oldsel == sel

No need to do it outside the call.