features from metadata

New

• units on colorbar and plots, from metadata file if exists (#60 (closed))
• symbol (double arrow) representing satellite orbit and LOS information on general view, from metadata file if exists (#60 (closed))
• Release notes in documentation! (#65 (closed))

Fixed

• deployment process on ist-oar (!43 (merged))

Changed

• color distribution initialized between 5th and 95th percentiles of first loaded band (#55 (closed))