changes in sbcl-2.4.6 relative to sbcl-2.4.5:

  * enhancement: name conflicts resulting from colliding symbols in IMPORT and
    USE-PACKAGE are resolved once for each name, rather than between pairwise
    colliding symbols.
  * enhancement: calls to structure constructors with type mismatches in
    default initforms cause compile-time warnings.
  * platform support:
    ** fix constant-folding of %log1p and %log2 on 32-bit x86.
    ** fix the encoding of popcntd on ppc64
  * bug fix: EXPORT could be tricked into exporting two distinct symbols of
    the same name from the same package.
  * bug fix: two-argument calls to LOG with arguments of different precision
    do not lose accuracy through insufficiently-precise intermediate values.
  * bug fix: :NEWLINE options in *DEFAULT-EXTERNAL-FORMAT* are respected when
    opening files.  (reported by Marco Antoniotti)
  * bug fix: extend type declarations for the iteration variable of DOLIST
    with NULL during the evaluation of the result clause.  (lp#942237)
  * bug fix: #\uE0 (LATIN CAPITAL LETTER A WITH GRAVE) was incorrectly not
    downcased with STRING-DOWNCASE.  (lp#2067841, reported by Matt Kaufmann)
  * bug fix: backquoted lists as arguments to MAKE-ARRAY were miscompiled.
    (lp#2069345, reported by Dan Bothell)
  * bug fix: resolve the circularity between the type system and the CLOS
    metaobject protocol more robustly.  (lp#2069502, reported by Jan Moringen)
  * bug fix: misplaced tilde in a logical pathname error message.
    (lp#2069995, thanks to Marco Heisig)
  * optimization: various speedups to UTF-8 based external format streams and
    other stream routines.
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