pyethereum -> py-evm conversion

According to https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=866167#20 upstream pyethereum is a deprecated project, and its functionality is being replaced by py-evm, and may already be broken, see: #264 ". pyethapp should use py-evm for anything it is currently using pyethereum for.

System/environment

• OS: Debian-derived
• python version: 3+

[carver]

Just FYI, trinity is being designed as a node on top of py-evm, and should (I believe) completely replace pyethapp functionality. Because of that, there may not be much momentum for doing maintenance work on pyethapp.

...is there a link for trinity? Is it on github?

[carver]

trinity is in the beginning build-out. It's not merged into master, which itself isn't in alpha release yet. trinity is currently a module in py-evm, on the trinity branch: https://github.com/ethereum/py-evm/tree/trinity/trinity

The expectation is that it will eventually get moved out to its own repo.