[Groff] roff mime types

[Bernd Warken]

On my Linux system, the files /etc/mime.types has:

application/x-troff             t tr roff
application/x-troff-man         man
application/x-troff-me          me
application/x-troff-ms          ms

This confirms what is "officially" considered an extension for a roff file.

But `mm' and `mom' are lacking.  Does it make sense to define a new 
extension for every macro package?  With a future `.require' in mind, a
common `t' would be good enough for all kinds of roff documents.
Both `mm' and `mom' and myself for the Gutenberg macro package `gb' must 
decide on this.

Bernd Warken