ENH: Update Sentinel-2 products to support format update

[remi-braun]

From what I see in this article:

From what we have heard at CNES, the changes will include :

• A change in the coding of the reflectances : an offset will be added to keep the zero as no-data value, and still enable to code for zeroi or negative reflectances in the products.
• The vector masks should be replaced by raster masks, which is probably not a simple change that you can implement with two lines of code.

The change should be put in production before the end of October

It should be easily tackled and should simplify the code (raster masks and GML removal)

[remi-braun]

Some samples can be found here

The deadline has been extended to the 15/11

[remi-braun]

Sentinel-2-product-specifications-document-V14-9.pdf

[remi-braun]

Done