Overall metobs api code style cleanup and reorganization

metobsapi/common_config.py

metobsapi/data_api.py

metobsapi/files_api.py

metobsapi/multiData.py

metobsapi/server.py

metobsapi/templates/index.html

metobsapi/test cases.txt

metobsapi/tests/test_data_api.py

metobsapi/util/data_responses.py

metobsapi/util/error_handlers.py

metobsapi/util/file_responses.py

metobsapi/util/query_influx.py