Changes

535656: [Table] Cell containing multiple values are not displayed
correctly in generated document
Update PapyrusService.getGendocTable method to build differently a table 
cell label when the cell contains a collection : instead of displaying a 
label of the collection, display a collection of label
Task-Url: https://bugs.eclipse.org/bugs/show_bug.cgi?id=535656
Change-Id: I7f558e4bfc47ba4d0f59382e4e82b95a14a70be4 Signed-off-by: ANNE
HAUGOMMARD <anne.haugommard@atos.net>