Fix hashing of negative values in DAOFoldManager.
Fix hashing of negative values in DAOFoldManager.

foam-framework/foam2,foam-framework/foam2,foam-framework/foam2,foam-framework/foam2,foam-framework/foam2,jacksonic/vjlofvhjfgm,jacksonic/vjlofvhjfgm,jacksonic/vjlofvhjfgm