cbarker211/Emissions_API: 2.6.0: Launch emissions in atmospheric layers.

v2.6.0 This updates adds launch emissions in atmospheric layers, fixes bugs, and streamlines the data. Launches Launch emissions now output in atmospheric layers (0-15, 15-50, 50-80, >80). Fixed issue with Falcon Heavy emissions, which were previously included for boosters only and always included regardless of whether they landed or not. Added booster propellant mass for Atlas D. Added Chang Zheng 2C SM upper stage. Re-entries Removed re-entries where the object exploded in orbit, and re-entries with re-entry destinations of "lost" and "Z". Removed some debris objects, most of which had zero mass anyway. Three new re-entries added in 2021 and 2025. Classified more objects as fairings where name includes "PLF", slightly decreasing emissions. Sorted out stage classification for some upper stages which were incorrectly being assigned 0 mass. Added Chang Zheng 2C SM upper stage. QOL additions with no impact on emission totals Minor QOL fixes to clean up the scripts, including removing discosweb related functions and removing unused packages. Combined date and time fields into single datetime objects. Raul data now loaded as a pandas dataframe. Updated re-entries with a location of '-1'. This was used a placeholder to denote named regions where I needed to assign the geolocation. OV1-7P re-classified as payload.