RegularGridDecomposition is broken

[gomezzz]

Issue

The problem

Currently particles not arriving (see

LADDS/tests/mpitestladds/distributedMemParallelization/RegularGridDecompositionTests.cpp

Line 244 in 3f6ddb8

// TODO currently there is a bug with comms for this decomposition, reenable when fixed

)

Expected behavior

Particles arriving

What needs to be done

Look into wha's wrong