TOULOUSE (Reuters) - Barely three months ago, Serge Dumas had one problem: how to keep up with record demand for the metal fasteners and bolts his small aerospace supply firm manufactures just north of Toulouse.Now, the head of Gillis Aerospace is wondering how to keep his 45 employees busy as Europe's aerospace capital reels from plummeting jetliner demand caused by the coronavirus crisis."In February, we were in the midst of euphoria and operating a just-in-time schedule," Dumas said,..