Several bug fixes:

1) properly manage hybrid matlab/octave computations;
2) check for function handles under octave, which cannot be saved on a mat file;
3) bug fix for non standard octave path;
4) synchronization fix under octave;
5) Retrieve missing output files when remote threads are finished;
6) check if input files have been updated, like in metropolis computations with load_mh_file=1;
7) check if output files are missing to trap synchronization failures: this may be inefficient and needs to be improved for unix/windows clusters;
8) fixed cleanup with multiple remote nodes.
(cherry picked from commit c9402d9e)