Lousy guitar tabs.

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* Generate guitar tab: hefesto --tlp=<main-tlp-file>
* Add new guitar tab: hefesto --add-tab=<main-tlp-file>
* Get a plain tab transcription: hefesto --get-tab=<main-tlp-file> [--out-dir=<path>]
* Generate all plain tabs: hefesto
* Generate encrypted tab(s): hefesto --gen-tab=<main-tlp-file-list> [--out-format=<pdf (default) | ps | txt | svg | html>]
* Rebase: hefesto --rebase