Psytester

* show: of bests/uniques/gain for each run (enabled/disabled in config)
* show: option for autohiding fails when there are no failed testcases

* versioning support (config files store the version of psytester)
* --groups: added VARN to automatically create N equally-sized bins for VAR variable
* show: prints number of tests for each group at the top
* general/merge_output_dirs config option to reduce the number of output files
* general/precision for custom precision of scores

* added --XXX-config commands
* support for new topcoder's testers, can automatically extract time
* lots of bug fixes

* initial broken version