support simple neighbors

[kiedtl]

In the README, you state that you don't support simple neighbors. I'm curious to know why.

[nullgemm]

Because I think they are misleading :D

With test -abc42 1337 23 what is assigned to a, b and c? I would say c gets 42, a gets 1337 and b 23, but that would mean the first number is assigned to the last option, and then everything is processed in the right order again, weird...
If it is not the case and a gets 42, b 1337 and c 23, then why removing a simple ? It makes it look like the value is connected to the c when in reality it is not the case.
We could also implement them on non-compound options only, but saving a or a = isn't really worth the extra code IMHO.
I also happen to not have a perfect vision at all, and separating the options and their values helps improving readability.

So for all these reasons I chose not to add simple neighbors.