case sensitive search for aemo_raw_cache files

[jotaigna]

Hi Team
If running from source in Python/Linux, aemo_raw_cache files are downloaded with an upper case .CSV extension, but are searched with a lower case extension, see

TDA_Python/tda.py

Line 515 in 5fcaa6d

aemo_name = 'data/aemo_raw_cache/PUBLIC_DVD_TRADINGPRICE_{}{}010000.csv'

As a result the pull down list of wholesale years shows "None" only. Editing the code and rebooting the flask app fixes the issue. If the nemosis module will always save files with the same case, then editing this line ought to be enough.

A very minor issue and only for silly old case sensitive filesystems.