Add reference to Reptorian's combinatorics library

[Reptorian1125]

Hello,

Recently, I just finished up on this thing and figured a few things. But, I feel that this needs review, so I am not pushing it. Yes, I made a folder as I plan to add Color Analysis library reference.

Thank you,
Reptorian

[Reptorian1125]

Great news, I solved rep_rde_compsel_poss now. Though, I think Windows specific examples needs chars addressed though. I'll figure that out if not reviewed by then.

Also, should I bother to mention which ones aren't optimized? The vast majority are optimized. The ones that aren't, are a few rde* variants, and they're pretty hard to deal with.

[Reptorian1125]

Recently, fixed up examples so that it's agnostic and not Windows-specific. I remove ">". Renamed poss to perm. And added comb variant. This has these changes. Decided against mentioning which one or which aren't optimized as there's just two command series with that problem. The majority of them are optimized.

[Reptorian1125]

Just going to mention that there's going to be combination variants of sum permutations commands. So, I wouldn't push it just yet. I know, no rush, and this can be reviewed later as well as #@cli documentation. I think that's probably the last of them that is missing. total_sum_combinations also can do full integer partition.

There is string_permutation, but I think that can be held off until I make string processing library that takes into account of codepage used. Not just permutation, every single rde_ commands can be used for string processing too.

[Reptorian1125]

Finally, added the combination variants reference after making them multiple threads compatible. It's pretty much ready. I can do something like start,end combinatorics, but for now, the images generators generates all of the possibility just for example usages. Having to use my own library, I tend to use index2list and list2index.

[Reptorian1125]

How should I provide #@cli examples for image generators?

Like this?

#@cli : $ +rep_permutations 6 r. 100%,100,1,100%,1

I know at 1 pixel high, it is hard to see the regular image. For non-image generator, it can be done using image generator and a call to the index2list and list2index. That's to verify correctness.