sw: fix massive temp dir leak in SwModelTestBase

Change-Id: I92455612c41564e74570b4ee4fa4e3cdfa20f24d
sw: simplify the temp-file leaking debug code in mail-merge

Change-Id: Ib0de8cc5977a8721511e62f39bf3a86a6a76250a
sw: fix temp file leak in SwDocTest

Change-Id: I493af417e9bf6c781638a5a2ec10c3bed32d1b8a
sw: WW8 import: delete leaked SdrGrafObj (and temp file)

The SdrObject returned from SvxMSDffManager::GetShape() is owned by the
caller; since it's not inserted anywhere it has to be deleted.

Change-Id: Iaac6467592ec4151173a586a6dc71f9bc44b44f0