darcs patch: System.Posix.Temp: improve haddocks for ... (and 2 more)

[gwern0 at gmail.com]

Mon Jan 18 19:27:55 EST 2010  gwern0 at gmail.com
  * System.Posix.Temp: improve haddocks for mkstemp to explain what that returned String actually is

Mon Jan 18 19:30:22 EST 2010  gwern0 at gmail.com
  * System.Posix.Temp: pad input filenames with 6 Xs
  If the argument doesn't terminate in capital Xs, the C mkstemp will simply bomb out
  with zero warning. This was not documented.
  By arbitrarily sticking a bunch of Xes at the end of all arguments, we guarantee that
  this exception will not be thrown, the type signature will not change, and no existing
  code can break (since if it was manually avoiding the exception by adding "XXX" itself,
  the temp files will now be simply 3 random characters longer, nothing worse).

Mon Jan 18 19:34:37 EST 2010  gwern0 at gmail.com
  * System.Posix.Temp: rm whitespace
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