Add new sensors: Landsat infrared thermal data

Using infrared thermal data can be useful for some classification problems.

Currently, iota2 not manage this kind of data.

The current proposition is to handle data from USGS:

• The optical bands: same process than the existing L8_old and L5_old data (gapfilling etc)
• The thermal bands: handle infrared (Collections1) or temperature (Collections2)

The data are already processed, provided by tiles, and corrected for atmospheric effects.

For thermal bands, the gapfilling step should be discussed as there is day and night acquisitions for infrared data. But only days ones as an associated temperature product.