Split code into modules, handle USR1, minor fixes.

[reservoir_sample] / README.md

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+# reservoir_sample #
+This is a small unixy command-line utility which will harvest an evenly-weighted random sampling from its input stream.
+
+## what ##
+While this sort of collation function can easily be implemented in a few lines of shell, here is a standalone utility specifically for the task, with a few frills.
+
+## who ##
+Justin Wind <justin.wind@gmail.com>
+
+## license ##
+cite or blame, as apropos
+corrections appreciated
+no warranties implied