Implement verifychain method and test

[GideonBature]

This is based on PR #116 on implementing one method at a time for easier review: This is the third method implementation: verifychain which returns a (bool type). Once this is approved, I’ll proceed with the next one.

[tcharding]

Except the docs thing everything here looks good - too easy!

[GideonBature]

Except the docs thing everything here looks good - too easy!

removed the unnecessary lines of the rust docs, leaving just a single line, as you suggested....

[tcharding]

While reviewing this I saw that we have the integration test for gettxoutproof in the wrong place (it shows up in the diff of this patch). Want to fix that?

FTR I'm as fallible as the next bloke, if you see mistakes please clean em up - its super appreciated. This repo is even more necessary to keep clean than most because its so big, boring, boilerplate. In general you can either do them as separate PRs, or if the PR you are working is going to include the mistake in the diff just put the fix as a separate patch at the front of the PR i.e., do it first in a separate patch (commit).

[tcharding]

ACK ae286f1

[tcharding]

Thanks man, you are killing it!

[GideonBature]

Thanks man, you are killing it!

Thank you.... I am learning from you...