more changes to python stage 4 script to make it work for stage 6

initial commit of python script from Alberto modified for stage6

running 2009 to 2014 region 4, stage 6 on bridge for testing

master script stage 6, minor bug for shell call

stage6 testing assessment part2 figures and call from the shell

initial commit for stage 7, mosaicing of predictions and accuracy layers productions

master script stage 6 testing assessment with figures

adding sourcing of relevant script for stage 6 assessment and debugging

master script stage 6 assessment, call to assessment function

master script stage 6, adding and removing relevant and irrelevant parameters