jah/ng0-packages: Collection of yet to be upstreamed packages for Guix @ master

ng0 7aa19c36d3 Add uemacs (and an unfinished bit of slrn).		%!s(int64=41) %!d(string=hai) anos
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packages	7aa19c36d3 Add uemacs (and an unfinished bit of slrn).	%!s(int64=41) %!d(string=hai) anos