Add short flags to commands about clef HOT 1 CLOSED

    parser.add_argument('-e','--experiment', type=str, nargs="*", help='CMIP5 experiment', required=True)
    parser.add_argument('-m','--model', type=str, nargs="*", help='CMIP5 model', required=False)
    parser.add_argument('-v','--variable', type=str, nargs="*", help='CMIP5 variable', required=True)
    parser.add_argument('-t','--mip', type=str, nargs="*", help='CMIP5 MIP table', required=False)
    parser.add_argument('-en','--ensemble', type=str, nargs="*", help='CMIP5 ensemble', required=False)
    parser.add_argument('-ve','--version', type=str, nargs="*", help='CMIP5 version', required=False)
    parser.add_argument('-a','--all-versions', help='returns all versions not only latest', action='store_true', 
                         required=False) 
    parser.add_argument('-w','--warnings', help='returns also warnings', action='store_true', 
                         required=False) 
    parser.add_argument('-o','--output', type=str, nargs=1, help='output file name', required=False)

    parser.add_argument('-a','--admin', action='store_true', default=False, help='running script as admin', required=False)
    parser.add_argument('-e','--experiment', type=str, nargs="*", help='CMIP5 experiment', required=True)
    parser.add_argument('-m','--model', type=str, nargs="*", help='CMIP5 model', required=False)
    parser.add_argument('-v','--variable', type=str, nargs="*", help='CMIP5 variable', required=True)
    parser.add_argument('-t','--mip', type=str, nargs="*", help='CMIP5 MIP table', required=False)
    parser.add_argument('-f','--frequency', type=str, nargs="*", help='CMIP5 frequency', required=False)
    parser.add_argument('-en','--ensemble', type=str, nargs="*", help='CMIP5 ensemble', required=False)
    parser.add_argument('-ve','--version', type=str, nargs="*", help='CMIP5 version', required=False)
    parser.add_argument('-r','--replica', help='search also replica', action='store_true', required=False)
    parser.add_argument('-n','--node', type=str, help='ESGF node to use for search', required=False)
    parser.add_argument('-p','--project', type=str, help='ESGF project to search', required=False)