Nemosis

Added 30 min data tables.

Reduced memory usage for EMS and MMS matching algorithm.

- Change bidding data back to using the monthly archive.

- Implements fix for AEMO changing file naming conventions on NEMWEB. Thanks Starstrike99 for raising 40 which raised this problem.
- Add the table INTERMITTENT_GEN_SCADA (this is a next day table so availability is limited to aprox the last 2 months). Thanks jthurley for raising 39 which suggested this addition.
- Added the DIRECTION column to bidding tables, which is needed now that there are bi-directional units. Thanks Starstrike99 for raising 41 which suggested this addition.
- A Windows EXE file for the GUI will be added to the release shortly.

Update excel file reading functionality to handle AEMO changing the tab name in the "NEM Registration and Exemption List.xls" work book from "Generators and Scheduled Loads" to "PU and Scheduled Loads". NEMOSIS should now work for both the old and new name.

A few minor updates:

- Added the table ROOFTOP_PV_ACTUAL. Thanks mdavis-xyz for the suggestion.
- Added data clean for the table Generators and Scheduled Loads such that all missing values of nan values are converted to '-'. Thanks mdavis-xyz for the suggestion.
- Improved datetime parsing. Thanks mdavis-xyz for the pull request.
- Added columns RAISE1SEC and LOWER1SEC to NEXT_DAY_DISPATCH_LOAD and DISPATCHLOAD. Thanks rccolle for the pull request.