Add a generic 'ring the bell' function (console bell on Linux and BSD,
/dev/audio on Solaris), and add DDX functions for this.  Make this the
core keyboard's bell.
Port Xvfb and Xnest to this.
Port XFree86 to this, with OS-specific hooks for Linux, BSD, and Solaris
taken from foo_io.c in the old layer.

Add motion history support (sort of based on the XFree86 DDX's
implementation) to the DIX.

Add untested first guess at what GetProximityEvents should look like.

Given they're just numeric constants, they should be included in
input.h, not inputstr.h.

Update the DEVICE_ABS_CALIB stuff to include the new elements.

New DEVICE_ABS_AREA support.

dev->touchscreen becomes dev->absolute, with _CALIB and _AREA stuff in it.

Update xfree86 to compile with this, kdrive needs an update too.

Move the keymap copying to event processing time (in
ProcessInputEvents), instead of being at event enqueuing time.
Break SetCore{Pointer,Keyboard} out into separate functions.
Change mieqEnqueue to take a device pointer, that asks for the
_original_ device associated with this event.

Take a first_valuator parameter, which specifies the first valuator.

Add a first_valuator parameter.  Looks correct by inspection, but untested
with first_valuator != 0 as yet.

Make Set{Keyboard,Modifier,Pointer}Mapping act on all devices which send core
events.
Change LegalModifier to accept a DeviceIntPtr.