NEMOSIS

• Replace print messages with logging, this means messages displayed by NEMOSIS can be controlled by the user as per the readme documentation. Thanks to @prakaa
• Fix bug where attempting to download bidding data that is not available on nemweb would cause NEMOSIS to crash. Not AEMO stopped uploading monthly bidding files to the public archive as of April 2021. If NEMOSIS can't find bidding in the archive, it attempts to download from the 'bid move complete' dataset, which only hosts a 12 month window of the most recent bidding data (https://www.nemweb.com.au/REPORTS/Archive/Bidmove_Complete/). If the bidding data is not available a warning is logged.