introducing new functions to manage Tile and Library and new TileSet class to compute l2a, cloudmasks and indices for multiple Tiles using multiprocessing"

moved monthly summary to sen2change, updated library function to get size of l1c products to archive with the size=True parameter

adding new utils to get tile len and size, and clean_lib update if less than 7 files in l2a 10m granule

correction to prevent nodata value change issue when producing jp2 indice mask images from jp2 indice images

Add the revisit_period parameter to the run method: number of days, since last tile's date, to check again for new images.

Add new parameter to remove Tiff format indices and 0B files while cleaning Tiles. Raw Tiff indices are now removed after being masked

Extracted L1C SAFE folder is now renamed like the dowloaded zip file in order to take into accound the change in SAFE name once archived by Sentinel 2 LTA (Long Term Archive)