clean up of lising of tiles and shapefiles by region

changes to generate function to check missing tiles and predict gaps

initial commit for script to check missing tiles and predict gaps in mosaic: script part 0 global product assessment

experimenting with ffmpeg to generate movie from gif

modifying function to check missing files and dates for predictions and others

adding function to check missing predictions/mosaics

debugging function

adding plot animate raster time series in function script

generating animation for region 4 for multiple years sequences

generating animation for region 5 for multiple years sequences