src/db_utils/creation_of_exon_table.py: major modification, this script will create and fill the cin_exon and cin_gene table of the new database model

src/db_utils/populate_database.py: creation of populate_df function (and other functions to lower code duplication) that fill the database directly with a pandas dataframe

src/db_utils/config.py: modification of prefixes gin to cin in Config.table + creation of Config.bed_exon and Config.bed_gene variable

src/db_utils/config.py: modification of Config.db_file and Config.output + deletion of LOGGING_CONFIG, logging_def and LoggingLevelError