Transfer an observing list from ST4 Visual to Imaging

[theskyhound]

I'd forgotten all about the option to import data from the Data menu, to be honest. That's a legacy function used to import everything except observing lists. Currently only the import of Chart Schemes is supported. I'll make that more clear on the dialog. Either that, or transfer the function to the chart preferences dialog where I intended it to end up anyhow. Sorry for the confusion.