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Created by Ricardo Grim Cabrita@grimMaintainer

Spark and database credentials and paths should be user configurable

There are a few instances of hardcoded network paths and credentials in the app.

For example:

app/utils/spark_utils.py
5:    .master('spark://127.0.0.1:7077')\
app/__init__.py
4:#from flask_mongoengine import MongoEngine
9:__mongo_host = "localhost"
10:__mongo_port = 27018

These should default to localhost and whatever is the default port; but also be user configurable via environment variables, such as HARMONIZATION_MONGO_HOST and optionally via config file.