fixed tests

test of @ste74 manjaro/packages-core/issue/97 (reverted from commit 2588b304)

test 2 of @ste74 manjaro/packages-core/issue/97 (reverted from commit 1d8e584f)

test 3 of @ste74 manjaro/packages-core/issue/97 (reverted from commit 6a208322)

test 4 of @ste74 manjaro/packages-core/issue/97 (reverted from commit 4e8f06db)

If new countries was supplied on CLI the custom-mirrors.json would reflect the change.

removed -g

renamed only_country to country_pool
commented obsolete functions

refactored signatures