Added a "nicer" way to kill clients.
I used the wrong atom name, fixed that and killing things nicely now works.
Disabled warnings when the root window is clicked.
Fixed killing multiple workspaces and using change_ws when it isn't needed. This should speed up killing workspaces.
Fixed the use of change_ws when moving a client to a different workspace.
Fixed not being able to kill the last workspace.
Prevented segfaults, killing multiple workspaces leads to infinite looping.
Neatened up the remove_client code that searches all clients on all workspaces.