src/clfswm-internal.lisp (place-frames-from-xinerama-infos): handle better no xinerama support case.

src/clfswm-internal.lisp (place-frames-from-xinerama-infos): Handle root screen resize on the fly when adding or removing a monitor.

src/xlib-util.lisp (handle-event): Ignore synchronous xlib window-error and drawable-error in event handler. contrib/clfswm: Dump different image from different installation path.

src/clfswm.lisp (configure-request handler): Send a configuration notify event in a more precise way.

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

src/clfswm-internal.lisp (show-all-children): (show-all-children): Let the choice to always display children or to optimize by hidding children not seen . The first option is better with transparency support (frames behind orther frames are seen). The second one is faster with many children in the same frame (not seen children are not displayed).

src/clfswm-internal.lisp (show-all-children): Hide only children hidden by normal windows or frames (but not :dialog, :transient...).

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: Take care of current child border size instead of placed window border size

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