GitLab

Renamed from describe-language-support.
Do the real work here; don't call describe-specified-language-support.
Print the mnemonics when mentioning coding systems.
Improve style of output.
(describe-specified-language-environment):
Renamed from describe-specified-language-support.
Don't do the work here; call describe-language-environment.
(describe-language-environment-map):
Renamed from describe-language-support-map.