New version 3.2

New version 3.2 published in April 2nd, 2022. News:
Added calculation of direct irradiance when downloading data from databases.
Added graph of direct irradiance.
Added possibility to consider Concentrating PV (CPV) modules or generators.
Corrected bugs when downloading NASA hourly data.
Corrected bugs of multi-objective optimization (when using unmet load as objective).
Corrected bug when calculating back surface irradiation if solar tracking (one or two axis) was selected.
Corrected minor bugs.