Correct reqs.txt to pip-requirements.txt URL

https://github.com/CounterpartyXCP/counterpartyd/blob/master/pip-requirements.txt
Merge pull request #211 from rippler/patch-1

Correct wrong reqs.txt to right pip-requirements.txt URL
comment about block reorgs
avoid floats
Merge branch 'develop' of https://github.com/CounterpartyXCP/counterpartyd into develop
removed unused API call, and updated docs
tweak BTC order, BTCpay logic
version bump
Merge branch 'master' into develop