Provide consistent naming for config parameters

[damb]

Adjust naming of the

[CONFIG_STATIONLITE]
# ----
# DB URL indicating the database dialect and connection arguments. For SQlite
# only a absolute file path is supported.
# See also:
# http://docs.sqlalchemy.org/en/latest/core/engines.html#database-urls
#
# db_url = sqlite:////abs/path/to/stationlite.db
#

and

[CONFIG_STATIONLITE_HARVEST]
# ----
# DB URL indicating the database dialect and the connection arguments.
# See also:
# http://docs.sqlalchemy.org/en/latest/core/engines.html#database-urls
#
# db_engine = sqlite:////abs/path/to/stationlite.db
#

configuration parameters within eidangws_config such that only a single keyword is used.