Experiments generators for PBS

- Added: Launchers_pbs is the entry point to send/reload runs to/from PBS.
- Added: Generators and reloaders for hierarchicalrandomnetwork characterisation. New form of experiments, should be kept in a unique directory for all.
- Added: Launchers are now loaded dynamically and automagically.
Improvements to PBS submit/reload, new generators/reloaders

- Added: Generators and reloader for normal weights and fixes to others.
- Added: Data reload in Launchers_PBS now works properly.
- Added: SubmitPBS has so now options: submit label, for ease of qstat'ing, wait_submitting to ease the load on the PBS scheduler.
- Added: Parameters to change the distribution of weights (for Hierarchical network), if they normalise and another activity threshold.
- Fix: Launcher modules found in the directory of the current running file, more robust/correct than just working directory.
- Fix: DataIO now creates directories automatically
Fisher information for 3 stimuli, uses PyTables

- Added: Fisher information computation for local effects for 3 items. Requires huge amount of memory, so much it doesn't fit into 8 Go… Switched instead to PyTables, and writes everything to disk with compression. Slow but at least runs. Should complete Fisher Information multiple stimulus
HierarchicalRandomNetwork support for different thresholds

- Added: Support for user defined threshold.