Morpho

When exporting data from Morpho, the directory selection interface is confusing.
When the file chooser appears, it expects you to single-click on the name of a
directory. Howver, most users would generally navigate to inside the directory
in which they want the export placed. Also, the label asks for a "File name",
when in fact you are selecting a "Directory" or "Folder" name.

Proposed solution: 1) Change the label to "Folder name", 2) allow the user to
either select the folder directly (from the parent) or to enter the folder and
select nothing. If their is no folder name selected when the user hits the
button, then morpho should select the current directory that the use ris in in
the file chooser.

Here's an example, given the that folders /a/b exist:

If user wants to save in b, he can either enter folder a and click once on b
then hit Save, or enter folder b and hit save. They would both put the data
export in folder b.