Added tests of StackedLayoutLR items for changeset 4affe87847245f05d60e0ad8f433fa9b85ffb2f3

This commit does not add PNG/SVG versions of the new tests (test11c/d/e) to tests-reference/
BUGFIX: VTA_BaseLine was not supported by rlabel.

Also added a number of test cases (misc1b to misc1g) which show that rotated labels with VTA_BaseLine are not displayed correctly. No reference files for these tests have been added.
Merge pull request #24 from DougBurke/patch

Added tests of StackedLayoutLR items (pull request #23)