Update 1.27.0

Cardano-node version 1.27.0 successfully tested on tested. During test period no issues were found.

1.27.0 will gradually be ported to our mainnet nodes

Update 1.27.0 (testnet)

Cardano-node version 1.27.0 is installed on our testnet servers. If during test period no issues are found we will port it to our production nodes.

Version 1.27.0 includes many fundamental changes that are needed to prepare for forthcoming feature releases (notably Plutus scripts in the Alonzo era).