Allow configuring data file paths

[bhavi-jagatia]

We are trying to run Orbdetpy in an environment that does not allow us to write data to the library file path. Would it be possible to make the data directories configurable via environment variables?

if (__name__ != "__main__"):
    _root_dir = path.dirname(path.abspath(path.realpath(__file__)))
    _libs_dir = path.join(_root_dir, "target")
    _jar_file = path.join(_libs_dir, "orbdetpy-server-{}.jar".format(__version__))
    _data_dir = path.join(_root_dir, "orekit-data")

[Shiva-Iyer]

Thank you for pointing this out. The develop branch now supports an ORBDETPY_DATA_DIR which can be used to override the default data location. It will be a while before I put out a new release i.e. merge to master.