o Add cardbus support (use pci attachment for now)

<bde>
o Add comments in some places to clarify some points.
o Don't typedef sc_p.  This isn't usually done in the drivers and may
  cause problems in teh future if C goes the C++ route of requiring
  one and only one definition for each and every type.  Instead use
  the current convetion of expanding struct ${1}_softc * inline needed.
o change some comments to be more style(9)-like.
o Define and use DEV2SOFTC to encapsulate storing/getting softc from a
  dev_t.  This also takes care of the missing cast from the examples.
o Define and use DEVICE2SOFTC, similar to DEV2SOFTC for getting the
  softc from a device_t.
</bde>

We still should have this generate foo_{isa,pci,pccard,cardbus,eisa}.c
and foovar.h from templates of some sort, but I was too lazy to do
that in this commit.  I did document it in the comments, however.

Note: bde-like corrections made with the help of my my portable
plastic bde icon.  Results with the real bde may vary with use.

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