darcs patch: #2053: add additional history functions (+1 more)

[Judah Jacobson]

The following patches reflect the discussion and consensus on #2053.
The discussion period has passed; can someone please apply them to the
readline repo?

Thanks,
-Judah


Mon Jan 21 21:05:36 PST 2008  alexander.dunlap at gmail.com
  * #2053: add additional history functions
  The following functions were added: readHistory, writeHistory,
appendHistory, historyTruncateFile, clearHistory, stifleHistory,
unstifleHistory, historyIsStifled, historyMaxEntries

    M ./System/Console/Readline.hsc +85

Tue Feb 26 15:39:29 PST 2008  judah.jacobson at gmail.com
  * #2053: Make readHistory/writeHistory return a Bool instead of
throwing an exception on failure.

    M ./System/Console/Readline.hsc -9 +10
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