Release Hush 2.0.1

[leto]

• [ ] Change configure version to 2.0.1
• [ ] Change version number in docs to 2.0.1
• [ ] Make sure CLIENT_NAME/etc thing that FiremartZ found says 2.0.1 too
• [ ] Update man pages via contrib/devtools/gen-manpages.sh, after changing configure version, make sure they say 2.0.1
• [ ] Update consensus rules to no longer talk to old nodes which do not have DPoW enabled at a prescribed block height
• [ ] Test latest code thoroughly, with txindex=0 and txindex=1
• [ ] Create git tag
• [ ] Add changelog notes to Github tag
• [ ] Make sure docs are updated
• [ ] Once tag is created, merge dev to master
• [ ] Ask FireMartz to create various binaries
• [ ] Ask Firemartz to update SWING gui wallet to latest hush binary