NBISweden/AGAT: AGAT-v0.0.2

Test suite improve (result based) for a better code coverage. Fix regression when introducing handling of off headers and top features (source, chromosomes). Improve access to json data (now saved in Omniscient in 'other' level) Header saved in omniscient (now saved in 'other' level) Fix scripts that were looping over every levels... now have to skip 'other' level. Add MANISFEST.SKIP Fix scripts that were not running after transplanting the code from GAAS to AGAT Add 'sort keys' in many scripts to be able to compare results (less efficient but good for reproducibility) Update README - add installation from Bioconda