GitLab

describe-cyrillic-environment-map and
setup-cyrillic-environment-manp.  Names of coding systems changed.
Give them more informative doc-string. Make iso-8859-5 alias of
cyrillic-iso-8bit, alternativenyj alias of
cyrillic-alternativenyj.  For Cyrillic, provide single langauge
environment "Cyrillic".
Delete the code of calling register-input-method.