request: posix-standard flags

[ghostsquad]

I noticed that tk accepts flags such as:

--extCode

I can't find explicitly if it's mentioned not to use capital letters in long option names, but this was definitely surprising when I found it, and doesn't follow many other conventions in other tools. I think this should instead be:

--ext-code

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[sbarzowski]

I think that if you make the change, you should keep the old variant as well (maybe undocumented), to avoid breaking existing scripts. (Just my 2 cents).

[sh0rez]

Oh, that change has already happened in #340 11 days ago. We decided these flags weren't widely used enough to care about compatibility here, so just went ahead converted to match what the jsonnet binaries do.

Closing as basically solved :)