Renumbered books and folders

FXL books (formerly 0200-*) renamed as 0201-0219

Simplified titles of all books; moved long titles and [UNDER
CONSTRUCTION] text to description metadata instead.

These changes make it easier for testers to tell which book they're
supposed to open for a set of tests.
Small corrections to make test content work more smoothly with the testing website

Corrected label for trigger-040

Added target element ID for test svg-doc-001 in epub-0100

Moved multi-column layout test in epub-0101 so it was nested properly
to sync with the website display

Added [REQUIRED] and test-id to the page-progression test in epub-0130

Split 1 page into 2 for epub-0220 so all test would fit in the Readium
viewport.

Added element ID for MO test mo-nav-230 in epub-220
Small fixes; renumbering

Changed a few spine orders to match the nav document.

Renumbered 216-219 so the test IDs are in order.