Alyx database doesn't support multiple mount points

[todo]

As Alyx doesn't support multiple mount points this method will

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alyx-matlab/@Alyx/getFile.m

Lines 25 to 30 in 96e6dbf

	% FIXME Alyx database doesn't support multiple mount points
	% @body As Alyx doesn't support multiple mount points this method will
	% simply construct the path from data_repository_path + relative_path,
	% unless the data_url field is not null. The data_url field is for some
	% reason complete while the others aren't. For this to work on Windows you
	% must map a network drive then set the data_repository_path to the SMB

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This issue was generated by todo based on a FIXME comment in 96e6dbf when #56 was merged. cc @cortex-lab.