TODO

more flexible length restriction options - probably flags to allow user to specify range of lengths of both lines and chars
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Experiment with iteratees instead of 'unfoldEntries'.  They might actually simplify things.
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print files in a tree in `misfortune -f` output.
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Add ability to get more interesting stats from files (average line count, min/max/avg line length, etc).
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Add ability to create more "interesting" distributions.  Maybe even use 'hint' or something to read in code on the command-line to compute a distribution.
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detect when a reindex is actually needed in 'appendFortune' and don't reindex unnecessarily.
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add ability to sort/randomize index files in strfile command?
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in checkIndex: random spot-check in for validity of table entries (mostly that they are consistent with the stats).
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create build flag to control whether/how often index files are sanity-checked after index-changing operations.
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support "-d" to stdout
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more write operations: insert/delete fortunes...
semantics for these could be tricky, since the order of strings in the file need not be the same as the order of entries in the index.
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Utility for finding duplicate fortunes