Differential revision stage 2

Summary

The goal of this refactoring will be to handle multiple node updates at the same time.

Involved components

• interface.py
• data.py
• network.py

Steps

Stage 1: remove useless things in the current code base [merged in develop]

• Remove IPC communications
• Move net client code to session
• Store data protocol in the repository configuration
• Remove threading

Stage 2: integrate replication as a submodule [#188 (closed)]

Stage 3: move data manipulation logic to repository.py and high level collaboration function to porcelain.py

• Move add to porcelain
• Handle commit and stage logic from repository

Stage 4: separate the replicated data protocol from the storage

• Add a Node class with the ReplicatedDatablock attributes [WIP]

Stage 5: handle graph modification within a commit object (stateless data handling)

• move all command related functions to the repository class