add a config option

[komuw]

kama.Dirp(x, ...config)

where config is optional.

struct config{
compact bool,
redact bool,
hideZeroValues bool,
}

maybe #24 should also be an option on the config struct?

[komuw]

adding configs is against a 'no config' principle of kama. this can be a slippery slope.

[komuw]

alternatively, do not compact at all.
In my usage, compaction is more of a nuisance.