Displaying of command errors could probably use some tweaking about powerline-go HOT 4 OPEN

The problem is that there is a standard (error codes between 64 and 127 are errors of the user or program, 128 means the error code is invalid, 129 to 255 are errors resulting from signals being sent), but this standard isn't really used.

Every program uses another standard for error codes, and generally 1 is used as generic error, 2 for usage, etc.

Grep and git grep use them differently, though.

I'm not sure if there is a better way, but I wanted to use meaningful names instead of numbers whenever possible.

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Yeah, I'm really not sure how to do anything better. Maybe this just needs some documentation updates.

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In this context in will be an improvement if the showing of meaningful names for errors, or the 'plain' exit codes, can be configured. In the case of the grep and git grep examples the parsing of the return prompt (as a human 😎) would be easier.

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Added a PR to make either meaningful names (default) or numeric exit codes configurable.

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