[Gambas-bugtracker] Bug #1339: gb.xml: Fix and document Mode argument

[bugtracker at gambaswiki.org]

http://gambaswiki.org/bugtracker/edit?object=BUG.1339&from=L21haW4-

Comment #1 by Tobias BOEGE:

Oh, and updated documentation would be nice, which was the initial point
of the mailing list entry.