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increment the parse_ variable on unnamed subcommands. update the readme, and add a formatter test for nameless subcommands in nondefault group with other named subcommands. add a test of default arguments add a formatter test add tests for unnamed subcommands and an example of the partitioned subcommands. change the app_p to be a shared_ptr so you can add an App later on and merge them together add the ability to add unnamed subcommands that allow partitioning on options into multiple apps.
