fixing data range for mosaicing, output dir and reading of assessment inputs

mosaicing script, major changes to further integrate code in the workflow

analyses of extremes more changes and debugging to record data

analyses of extremes, debugging assessment part5

analyses of extremes, fixing figures for assessment part 5

analyses of extreme values part 5 assessment, examining frequency of extremes by tiles

analyses of extreme values, part 5 assessment script adding section for missing values

initial commit new code for extreme values study, scaling up assessment part 5

running assessment overall for region 23

overall assessment 1996-2014 for region 5 using stage 8 master script