Comment 0 for bug 1161971

While reviewing the conf files of numerous graphic objects, I note that some, but not all, farm "field" and "resi_x" pngs as well as the "ashes", "destroyed_building" and "ship_construction" graphics contain a "pictures=" parameter that references a single image file. (For example the parameter is found in the conf files for the empire field0, field0s and field0t objects, but not in the field1 and field2 objects.)

The file referenced is typically the idle_00.png or its equivalent. The graphical object in all instances are "immovables".

With a conversion to spritemaps which can yield one image map file v.s. multiple single images, the need for support of this picture parameter comes into question.

If it is not needed, it should be removed. However, if it still provides useful functionality, the spritemaps conversion should take that into account.