Ambiguous Deep Fatal Error

[samuelwestlake]

When given an incorrect file/directory path as a data source, the resultant error says: 'Loading from premade dataset not implemented yet'.

This seems to be because the code assumes that if the path doesn't exist, we must be trying to load a pre-made dataset, but this isn't always the case.

[Ahleroy]

This should be solved when merging the "DataStore" branch into master.
I keep the issue open and will close it when its done.