crawling more information

[felixvonberlin]

This pull request allows the crawler to determine:

• the block height
• the minimum transaction fee required, and
• the ledger version
  of the crawled nodes.

It also allows the crawler to determine

• the common required transaction fee, and
• the common block height
  in the network, if possible.

[codecov-commenter]

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[cndolo]

Thank you for your contribution @felixvonberlin.
There are, however, a couple of things that need to be addressed before merging.

[felixvonberlin]

@cndolo I have followed most of your advice; but in some cases I would like to discuss them first.

[cndolo]

Thanks for your patience and addressing the comments @felixvonberlin . I still have a few minor issues and would be willing to merge once you have addressed those.

[felixvonberlin]

it's fixed ;-)