Import of vwm2 changes from published source tgz

 Major changes from vwm1:

  - GNU screen-based "console" integration for monitored launching of X
    clients via screen remote commands, replacing the simple double fork
    approach used in vwm1.  Clients exiting with non-zero status retain
    their screen window in the console for 86400 seconds, facilitating
    easier debugging and troubleshooting.  The console xterm is accessed in
    the shelf and has a red border by default.

  - Xinerama/multihead support backported from vwm3, including the "screen
    fencing" implementation facilitating screen-oriented window focus
    cycling.

    Shifting the Mod1-Tab window cycling focuses the next most recently
    used window on another display.  Unshifted stays confined to the
    current display.

  - SYNC extension integration for prioritizing the WM over other X clients

  - setpriority() integration for "nicing" X client processes relative to
    the WM process

  - "autoconf" windows, horizontal/vertical halfscreen windows,
    quarterscreen windows in addition to the full/all screen functions.

    Mod1-[ and Mod1-] resize the focused window vertically with left and
    right justification to half the screen in width.  Shifting these does
    the same thing just horizontally.  Repeating the operation with a
    second ] or [ press quarters the window in the respective screen
    corner, extending upon the repeater pattern established in vwm1 for
    full/allscreen windows with Mod1-k[k[k]]

  - Exit now requires 3 consecutive strikes of Mod1-Esc

  - Introduction of a README file

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