checking missing files for region 5 with check_missing function

testing checking missing files/mosaic function

moving check missing function and testing it

adding checking missing tiles and moving plotting and animate raster time series to function script

more changes to function and debugging

modifying plot animate raster time series in part 2 global product assessment

modifying function to generate animation to accept list of files and additional documentation

adding function to generate animation in part 2 function script

Changes to plotting function for raster mosaic and other

initial commit for functions script part 2 global product assessment