That kind of works, in my Browser I re-ran mydomain/w/mw-config, and after entering my upgradekey, it tells me that "GNU diff3 not found".
I then added into my LocalSettings.php file, the entry: $wgDiff3 = "/usr/bin/diff3"
, and re-ran /w/mw-config, but no change.
After a bit more research, I found that my PHP was not accessing scripts in /usr/bin (see "UNIX utility binaries not found")
On my Plesk server, the solution was to go into my Control Panel, and in "PHP Settings", add :/usr/bin/
to the open_basedir settings, so that it now read: {WEBSPACEROOT}{/}{:}{TMP}{/}:/usr/bin/
(this may be different for others). There was also no need to set in my LocalSettings.php file $wgDiff3 = "/usr/bin/diff3"
(as this is the default anyway).
Another benefit is that the configuration now says: Found ImageMagick: /usr/bin/convert