Throw a critical error while parsing the supplied config file when a parameter is not configured or configured incorrectly (empty value) in the config file

Sync analyses and organism in run_workflow_phaeoexplorer.py, added organism picture for tripal pages

Move constants to file constants.py. Change config root to dict and update parse_config(). Change some config parameters name (galaxy_persist_data, tripal_banner_path, jbrowse_menu_url), update example config file and compose templates. Remove apollo config variables (webapollo_user, webapollo_password) in config file and in gspecies compose template, because apollo service not deployed here. Factorize parse_input() et parse_config(). Update description of scripts in main. Set default config file in scripts. Remove useless variable datasets_to_get in gga_get_data.py. Update README.md.

Fix logging text. Keep species with best assembly in get_uniq_species_dict_list() (will be main jbrowse url).

Separated gga_load_data into a get_data part and a load part. Also handling the get_data part with specific paths and fixed some issues with the code (reworked functions and removing deprecated code).

jinja templating, more workflow changes, trying fixes for the jbrowse gmod tool using API (in progress)

more config options (host, passwords, tripal themes), adapted methods to handle several histories in the same instance