Commit [8a19ff] Maximize Restore History

Fix a regression in APPEND type derivation.

Do not just test the arguments for validity by being subtypes or
supertypes of LIST, but also if it's a subytpe of NULL, since ATOM or
SYMBOL won't satisfy the LIST tests.

Regression since f32ee7d.."Better type derivation for APPEND, NCONC,
LIST.", reported by Eric Marsden.

Stas Boukarev Stas Boukarev 2013-05-31

changed src/compiler/srctran.lisp
changed tests/compiler.pure.lisp
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