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343a730a04
* add a needs method to the app/subcommand * add some needs subcommand tests * add a few more subcommand tests for needs and alias * fix shadow warnings * add some tests of the error pathways and fix a few anomalous conditions on the Option excludes function * add needs and alias functions in the readme * add some tests of ignore_case and underscore with the alias operations * add a few more test cases for needs option groups * add callback tests with needs and add a few comments in the readme * update formatting * add error checks on the aliases and restrictions on valid names for subcommands and aliases * add checks for matching subcommands and improve error return values to include the offending name * add some tests of the alias errors * add some more tests to check subcommand name matching during addition * add some additional tests and remove a redundant chunk of codes * add some more checks of subcommand name overlap in option_groups * allow disabled subcommand to bypass name matching check