Mmtester

* complete overhaul of cmd line help
* --help will only show the explanation for arguments relevant to your mode (e.g. run, show, find)
* help descriptions should be more clear now
* some of the commands are invoked differently, most notable run is now "mmtester r ..." instead of "mmtester ..."
* run: patterns for extracting the score / metadata are converted to regex and are editable in the config files
* show: new option --var VARIABLE in order to show stats for VARIABLE instead of score
* show: --noscale override to remove scaling from cmd line
* run: removed support for AHC generator; running generator single time manually is always going to be easier than configuring it to work with mmtester
* show: additional "Missing" column for tests missing score (or a specified variable)
* find: you can use --tests as a filter
* run: removed --benchmark as it was a cumbersome option and was inferior to just running "mmtester show" during the run
* tester.py functions as a stand-alone script (if you need changes, you can create local copy of tester.py run it from current directory)

* separate predefined configs for topcoder/atcoder

* added support atcoder heuristic contests (AHC)
* new & improved documentation
* added support for multiple config files; --XXX-config replaced with --config-XXX commands
* renamed/added bunch of cfg options to accommodate for atcoder support

* added --generate-scripts (initial support, format might change in the future)

* 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 mmtester)
* --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