Neurokernel core configuration mechanism

[lebedov]

The core Neurokernel infrastructure should provide a means of explicitly configuring certain options not related to specific LPU models. These might include

• location of OpenMPI installation
• MCA options to use when launching an emulation
• global logging setup

A simple interface to such options could resemble that of mpi4py or matplotlib, e.g.,

import neurokernel.rc
neurokernel.rc['openmpi_home'] = '/opt/openmpi-1.10.1'
neurokernel.rc['mca_opts'] = ['--mca', 'btl_cuda_if_include', 'eth0']
neurokernel.rc['log_opts'] = {'screen': True, 'file_name': 'nk.log'}

import neurokernel.mpi_relaunch
...