[#520] ungraceful fail upon send when using only vanilla Bitcoin Core as backend
Merge pull request #523 from ouziel-slama/master

[#520] ungraceful fail upon send when using only vanilla Bitcoin Core as...
Merge branch 'master' into develop
fixed bug related to new use of python-bitcoinlib; tweak verbose `list_tx()` logging
fixes (#524)
remove addrindex cache for unconfirmed txs
Merge pull request #525 from ouziel-slama/master

remove addrindex cache for unconfirmed txs
bug fix; update CHANGELOG
Merge branch 'master' into develop

Conflicts:
	lib/blocks.py
	lib/util.py
fix bad merge
allow manually providing pubkeys for multi‐sig (fixes #413)