data addresses for charts should, by default, not include the sheet name

Submitted by Frédéric Parrenin @parrenin

Link to original bug (#684192)

Description

Steps to reproduce:

• create a simple sheet with formulas and a chart, e.g. A1 1 A2 2 B1 2 B2 4 C1 =B1 C2 =B2 and an XY plot with X=A1:A2 Y=C1:C2
• select all the cells and copy to another workbook => the references in C1:C2 are still relative, but the references in the chart are absolute

Version: git master