Added error dialog when setting invalid main file directory #1921
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Many users set file directories by copy pasting the path and not by opening the file chooser. This means invalid paths could be set in preferences -> File -> main file directory
See JabRef#109 for more information.
Now the preferences tab won't save an invalid path anymore and notifies the user about it.
Also there is now an error message when trying to download a file to a directory which does not exist or can not be written to.