from a single graph with different data sets on it.

Trying to make overlayable graphs

re gainseville-green:#436

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darcs-hash:20080129233554-18786-4213bf9c599bba8f2da6963160f4a822e5a6eeb9.gz

darcs-hash:20080119051300-18786-d763799e3f082287e244bda0cf18f1b167699397.gz

adding a utils file with edi weitz-like anamorphic macros to replace the ones from arnesi, which isn't asdf-installing for me right now

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darcs-hash:20080116172641-ac9f3-d5177b96a22efa2b402f691779660ec5112bc212.gz

darcs-hash:20080102171603-ac9f3-b20db993f715ea81d4bd8909893a29836ced5a22.gz

darcs-hash:20080102142706-ac9f3-ce9d370460ddc64cfbea988d7aaf35302f0cde08.gz

darcs-hash:20071231151936-ac9f3-ee64aed8c7df4fddec9a22c87946f9a882ad2216.gz