Altered wds_wait's interface as the current one didn't have a chance to work

in early probe code under the bus.h system.  Make debugging runtime
configurable.  Some s/u_char/u_int8_t/ work.  Set ia_iosize to a sane value.
Move wds_init up before the setting of the DMA machinery to cascade mode (from
Charles Hannum).  Add ISA bounce-buffering code inside #ifdef notyet.  In the
-ASC case buffers could never be gotten due to forgetting some braces, added
them.  Removed a possibility of a NULL deref in some diagnostic printouts.
Unmap the I/O area after the probe.  Cache the bustag and the iohandle in
wds_init.  Did set WDS_IO_PORTS to 8 as some code indicated it might take up
that much even though I only know of three ports in there..  This might be
changed down later again.

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