testing mosaicing code with python option on NEX

debugging code for mosacing with new options and plot screen function

testing python option on NEX

adding python script option from gdal modified merged Alberto

testing mask and python path on Atlas

adding mask option debugging

function mosaicing adding mask and path to python/gdal binaries

testing code on NEX with python mosaicing script from Alberto

more modifications to mosaicing function

script mosaicing function, adding raster accuracy metric funtion