Feature/dewrangle volume hash

[sickler-alex]

Pull Request Name

• partially closes https://d3b.atlassian.net/browse/D3B-192
• README entry added if new functionality
• fixup commits are appropriately squashed

[Description here]

This PR removes the dewrangle command and adds a volume command and hash subcommand. The hash command is largely a copy from https://github.com/d3b-center/dewrangle-python. I'm going to reorganize and document it in a later PR, but this serves as an initial copy.

[HuangXiaoyan0106]

@sickler-alex Is there any reason, why we don't use d3b dewrangle as the main command? I'm thinking there will be several sub-commands like hash volume, list volume...

I think the main commands should be structured around the key categories.

d3b validation
d3b dewrangle
d3b registration
...

[sickler-alex]

That's a good question and I don't really have a good reason. I renamed it Dewrangle in #4.

[HuangXiaoyan0106]

That's a good question and I don't really have a good reason. I renamed it Dewrangle in #4.

yeah, have approved 4 and this one.