Refactor: MPI communication in translation modules

[sontheimer]

Aspect	Detail
Summary	Refactor the translation modules to use MPI communication instead of multithreading
Task Area	Refactor, Implementation,
Assignee	@sontheimer
Information
Prerequisites
Dependencies

Summary

The current implementation uses MPI intercommunicators, sending and receiving as well as Multithreading for connection and communication. To prevent deadlocks and related issues, this refactoring will move to pure MPI communication. This also enables scaling in the future.

Tasks

• [x] Move all MPI connection and communicator creation to a separate location
• [x] Move all communications, Threads and MPI, to a separate location
• [x] Start refactoring the translation code to MPI.
  • [ ] NEST to TVB direction
  • [ ] TVB to NEST direction

Requirements

## Acceptance criteria The test used as green-light after each change/commit: `test_translation_nest_to_tvb.sh`

[sontheimer]

Duplicate of #14. Copied overlap and closed this issue.