Change the worm(4) man page to note that there is no longer a worm(4)
driver, and point users in the right direction for similar functionality.
The functionality that used to be provided there is now

Change the worm(4) man page to note that there is no longer a worm(4)
driver, and point users in the right direction for similar functionality.
The functionality that used to be provided there is now provided by the
cd(4) driver and cdrecord.

Fix cross-references in a few other man pages. (i.e. delete references to
things I haven't written yet)

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Add man pages for the passthrough driver and the CAM transport layer
driver.