[doc,system] Fix <day-of-week> documentation.
[system,date] Clean up whitespace.
[doc,system] Document as-rfc822-string and as-rfc1123-string.
[doc,system] Document format-date.
[doc,logging] Link to new format-date docs.
Bug 7458: Implement primitive-machine-word-shift-left-with-overflow

* sources/dfmc/llvm-back-end/llvm-primitives-machine-word.dylan
  (primitive primitive-machine-word-shift-left-with-overflow): Implement
   left shifting with overflow detection.
Bug 7458: Implement more double-word division primitives

* sources/dfmc/llvm-back-end/llvm-primitives-machine-word.dylan
  (primitive-machine-word-double-divide-quotient,
   primitive-machine-word-double-divide-remainder,
   primitive-machine-word-double-divide,
   primitive-machine-word-unsigned-double-divide-quotient,
   primitive-machine-word-unsigned-double-divide-remainder,
   primitive-machine-word-unsigned-double-divide): Implement primitive
   function emitters.
Bug 7458: Implement still more double-word division primitives

* sources/dfmc/llvm-back-end/llvm-primitives-machine-word.dylan
  (primitive primitive-machine-word-floor/): Factor out adjustments
   into op--machine-word-floor/.
  (op--machine-word-floor/): New separated-out method.
  (primitive-machine-word-ceiling/): Factor out adjustments
   into op--machine-word-ceiling/.
  (op--machine-word-ceiling/): New separated-out method.
  (primitive primitive-machine-word-round/): Factor out adjustments into
   op--machine-word-round/.
  (op--machine-word-round/): New separated-out method.
  (primitive primitive-machine-word-double-floor/-quotient,
   primitive primitive-machine-word-double-floor/-remainder,
   primitive primitive-machine-word-double-floor/,
   primitive primitive-machine-word-double-ceiling/-quotient,
   primitive primitive-machine-word-double-ceiling/-remainder,
   primitive primitive-machine-word-double-ceiling/,
   primitive primitive-machine-word-double-round/-quotient,
   primitive primitive-machine-word-double-round/-remainder,
   primitive primitive-machine-word-double-round/,
   primitive primitive-machine-word-double-truncate/-quotient,
   primitive primitive-machine-word-double-truncate/-remainder,
   primitive primitive-machine-word-double-truncate/): Implement primitive
   emitters.
Bug 7458: Fix LLVM type of primitive-double-integer-as-double-float

* sources/dfmc/llvm-back-end/llvm-primitives-float.dylan
  (primitive-double-integer-as-double-float): Generate a <raw-double-float>
   value.
[doc,library] Document date parsing.
[doc,system] Missing #key signifiers.
Add logging-test-suite* registry entries.
Build and run logging tests.
[doc,building-with-duim] Fix figure captions.
[doc,lid] Replace DRM page refs with links.
[doc,lid] Correct Jam example.
[doc,c-ffi] Discuss linking against libraries.
[doc,release-notes] Mention date and C-FFI updates.
[doc,release-notes] Correct link to logging.

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