Some tiny remarks

[StefanSalewski]

Some tiny remarks

[c-blake]

I changed the cligen/argcvt.nim auto-help for enums. Those auto-helps are really only placeholders. Anyone even remotely picky/choosy/selective about help messages is expected to add their own help = { "quality": "one of: low, medium, high" }. I would have taken it out of doc comments, too, if that were a convention in Nim code for parameters (like in Java), but it is not.

I would have to punch a new release for this to be nimble-available. I could do that, but I literally just did one yesterday. And maybe you will come up with other ideas. So, I'll give it a few days at least.

I also added nimble as a first, git cone a 2nd idea. { Competent friends have conveyed to me that nimble is undependable (and I personally find it to have various problems). } Since, in my experience, writing a little CLI tool is how many people try out a new prog.lang., and since nimble seems "rough", I try to keep cligen from depending upon anything else, including the package manager and including those install instructions. But I am ok with "dual dependency" as per the new text, and nimble priority as "simpler when it works".

Github recently-ish moved to https only breaking that. I hadn't noticed. Thanks. Fixed along with At -> at.

The grammar at the end of the readme is/was (I think) technically correct but the idea is confusing/complex - a (singular) starting point for (plural) usages is the (singular grammatically of a plural thing) collection of things. I just made it all plural and re-arranged it. Not sure if it's better. { It's also not quite absolutely correct in that there are probably 3 or 4 advanced usages just "tacked on" to existing test programs. }