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The docopt-go library is quite convenient, but it has been abandoned for a while :( Since we only use it for chasquid-util, this patch removes it and replaces it with a custom small parser, that is a reasonable fit for the required use cases. The patch also adds a couple of tests to increase coverage. NOTE: docopt-go accepted some undocumented behaviour, in particular the use of "-a b" instead of "-a=b". The new parser does not, so some user scripts may require updating. I think this should be rare enough not to be worth the complexity of adjusting the parser to allow it.