[bug#40815] gnu: Add metamath

[elaexuotee]

Hell,

Thanks for the quick turnaround.

> The book looks like a related project to metamath, like advanced
> documentation, not like a regular manual. I didn't read it, so it is
> just a guess.

Oh, okay. That makes sense. PDF as official documentation is certainly strange
for what looks like a cli program. In this case, it just happens that this is
the only reasonable documentation, aparth from the website, for using and
understanding Metamath proofs.

> I do. In any case, if you want to keep them, they need to start with two
> semicolons, not a single one.
> 
> WDYT?

I trust your initial impression on this one. Let's use the patch from my
previous email that excises the commented out code. Does it look reasonable?

Cheers.

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