Remove doc/sbcl-asdf-install.1.
Add missing ASSERT around RAISES-ERROR? in some tests.
Delete *BACKEND-SB-NAMES* and *BACKEND-META-SB-NAMES*.

*BACKEND-SB-LIST* is as good as a hashtable for 6 things.

Other deletions from package-data-list due to a prior change.
Replace (assert (raises-error? ...)) with assert-error.