allow cost / set-icon to be displayed in body-top ONLY (#258)

previously, if you used, ie, "--cost=body-top", the cost would show in
the tab AND body-top.  Since the help text implies that the way to
accomplish this should be "--cost=tab --cost=body-top" (and because if you
put it in body-top, it's probably because you want to save space on the
tab)

tests/layout_tests.py

@@ -32,3 +32,47 @@ def test_sleeved():
     assert options.dividerWidth == 9.4 * cm
     assert options.labelHeight == 0.9 * cm
     assert options.dividerHeight == 6.15 * cm + options.labelHeight
+
+
+def test_cost():
+    options = main.parse_opts([])
+    options = main.clean_opts(options)
+    assert options.cost == ["tab"]
+
+    options = main.parse_opts(["--cost=tab"])
+    options = main.clean_opts(options)
+    assert options.cost == ["tab"]
+
+    options = main.parse_opts(["--cost=body-top"])
+    options = main.clean_opts(options)
+    assert options.cost == ["body-top"]
+
+    options = main.parse_opts(["--cost=hide"])
+    options = main.clean_opts(options)
+    assert options.cost == ["hide"]
+
+    options = main.parse_opts(["--cost=tab", "--cost=body-top"])
+    options = main.clean_opts(options)
+    assert set(options.cost) == {"tab", "body-top"}
+
+
+def test_set_icon():
+    options = main.parse_opts([])
+    options = main.clean_opts(options)
+    assert options.set_icon == ["tab"]
+
+    options = main.parse_opts(["--set-icon=tab"])
+    options = main.clean_opts(options)
+    assert options.set_icon == ["tab"]
+
+    options = main.parse_opts(["--set-icon=body-top"])
+    options = main.clean_opts(options)
+    assert options.set_icon == ["body-top"]
+
+    options = main.parse_opts(["--set-icon=hide"])
+    options = main.clean_opts(options)
+    assert options.set_icon == ["hide"]
+
+    options = main.parse_opts(["--set-icon=tab", "--set-icon=body-top"])
+    options = main.clean_opts(options)
+    assert set(options.set_icon) == {"tab", "body-top"}