[GNC] Changing Location of GNC_USERDATA_DIR and GNC_USERCONFIG_DIR

[Griffin]

I have reset my Windows 10 computer so that apps are stored on a 
separate drive from the OS. I'm told that it makes things simpler i/when 
you need to restore the OS.

My data is on a separate drive too, and now I want to change the 
location of the two items currently stored in my AppData folder.

I see the Help window, and I've looked into the wiki, but I cannot find 
a reference to either GNC-USERDATA_DIR, or GNC_USERCONFIG_DIR.

I did initially think that clicking on the link in the about window 
would allow me to change the location, but that is apparently not so.

So how do I change these locations?

Louise