Window Avoidance
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	Description This utility defines a mixin CLOS class which can be used to prevent the overlapping of windows belonging to different classes. It is very useful when working with a mixture of tool palette windoids and ordinary windows. Documentation WINDOW-AVOIDANCE-MIXIN, when mixed in with a window class, affects the zoomed size and position of a window in such a way that the window will not be overlapped by other window classes, provided certain conditions are met. This is very useful when working with tool palette windoids.An instance of a given window/windoid class (AWCI) will be avoided if at least part of the AWCI is outside of the window's area the AWCI is close to an edge of the screen the *longest* side of the AWCI is the one closest to the edge This allows the user to position any AWCIs along the edges of the screen, then zoom a window to occupy the free space between them. Any AWCIs in the middle of this free area (i.e. not near to any edge) will be treated as "free" AWCIs. Rule (1) makes it possible to use the full size of the screen, if the user so wishes.WINDOW-AVOIDANCE-MIXIN takes an :AVOID initarg which should be a list of window/windoid classnames to avoid. See the source for more information.The user can customise the behaviour by specializing VIEW-AVOIDANCE-BOUNDARIES.AVOID-WINDOIDS-MIXIN is a specialization of WINDOW-AVOIDANCE-MIXIN which is used to avoid windoids. Acknowledgements Special thanks to Adam Alpern who contributed to the code.