ReGPG::Login: simplified basic auth support
The trailing options argument to `read_login` was kind of ugly, and for code that needs options it isn't much harder to use the `new` constructor. So, get rid of options support in `read_login` (leaving only the check list) and also remove the `basic` alias for `auth_basic` to make it more clear what is the purpose of the option. This is a breaking change, but ipreg is the only user at the moment, and I have refactored the ipreg code to use `new` where it needed the `auth_basic` option.
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