Sentinel-toolkit

The problem was that in the for loop that iterates the ecostress examples, a variable with the same name as an outer scope variable was used. This lead to weird interference, as in the loop also the outer scope variable was queried, but its value was already changed from previous loop iteration.. Now everything is copied, so that such an issue cannot occur anymore and the outer scope data remains untouched.

1. When running the converter main script, you can now use -i d65/identity or you can provide your own illuminant with -if . The supported file format is: . For example:

dtype in profile is now properly stored as string.
fixed failing test that was lacking all the profile properties.

Changed dn values to float64 type so all the data is in float64 - dn values, solar irradiances, resulting sentinel_responses, rasterio profile dtype

Improve README.md
Fix S2Product.dn_to_sentinel() to update the profile to the resulting image profile (float64 on a 64 bit system)

Add examples for working with S2Product and S2ProductMetadata
as well as converting from dn to sentinel responses.