Core: ExperimentExporter saves relative paths to datafiles
When opening the GUI from a different directory and loading the intermediate .nsx
file, the date file strings point to the wrong locations:
terminate called after throwing an instance of 'std::runtime_error'
what(): IData, file: p15843_00027666.tiff does not exist
The exporter should either save the absolute paths, or preferable look for the files in the working directory.