Fix stacking of transients and new windows in max_stack mode.

Fix issue in libswmhack that can cause applications to crash.

Fix issue in mouse button handling that could cause a segfault.

Improve focus handling so related windows are raised when appropriate.

Fix ConfigureRequest handling of floating windows in max_stack mode.

Fix issue in startup where managable windows are sometimes not managed.

Fix possible focus issue when changing focus with keyboard bindings.

Add debug output to grab_windows function.