Fixes numpy deprecation warning; recompile extension modules.

Extension modules are a subpackage 'ext' with own makefile for f2py
stuff. Need to check if everything is working correctly.
fix input with more than 3 columns
matplotlib OPEN-specific configuration file
python interpreter information
update ignore rules
Fix issue in genetic algorithm; First implementation of MultiNest.

MultiNest algorithm is included but for now can only be run from a
system call. There is a new 'nest' command to do this. In this way
MPI is enabled, output is redirected to the OPEN prompt and
hopefully I can implement some sort of live plotting in the future.