Move child in its original parent if no destination child is found. Show all children before waiting the child move.

src/clfswm-internal.lisp (delete-child-and-children-in-all-frames): Remove all children in frames and only close windows.

src/clfswm-util.lisp (show-current-root): New function and configuration menu to display a message on the current root.

src/clfswm-util.lisp (eval-from-query-string): Show a notify window when updating symobls list for REPL completion.

src/clfswm-internal.lisp (show-child): Show unmanaged windows on (maybe) current child in all roots.

src/clfswm-util.lisp (find-child-under-mouse-in-child-tree): Handle children from all roots instead of from  *root-frame*.

src/clfswm-placement.lisp: Each child can have its own border size. New binding to change the child border size on the fly.

src/clfswm-internal.lisp: Remove the *current-child* variable and use a setfable function (current-child) instead.

src/tools.lisp (add-new-hook, add-hook): New macro. Do not duplicate hooks by default. Use add-new-hook if you want to duplicate them.

src/clfswm-util.lisp (jump-to-slot, add-frame-in-parent-frame): Change *current-root*	only when needed.

src/clfswm-util.lisp (place-frames-from-xrandr, swap-frame-geometry, rotate-frame-geometry): New helper functions for multiple physical screen.

src/bindings-second-mode.lisp (set-default-second-keys): New key binding to set window and frame transparency. src/bindings.lisp (set-default-main-mouse): New mouse binding to set window and frame transparency.