split up epub-0100

Split epub-test-0100 into:

0100: reflowable content documents
0101: stylesheets
0102: scripting
0103: font embedding & obfuscation
0104: tts

I removed ".. in a reflowable context" from all except the first title,
as it implied that there were a parallel set of FXL tests for things
like fonts, tts, etc; which there aren't.

The reason for splitting this book up is to be able to display more
finely-grained high-level categories and scoring on the EPUBTest
website.

The other option was to modify the EPUBTest website import
configuration to point inside a book, but this was deemed too
complicated to maintain.
Updating svg content document tests and fixing some test descriptions
'structural' fixes for tests

Broke apart test math-020 into four separate tests.

Re-ID'd tests for orientation and spread (they all had the same ID)

Re-ID'd tests for styling that were all mistakenly labeled 'style-221';
added to nav document.

Re-ID'd media overlays tests to look more like the other tests
(label-010).
missing svg file
Merge branch 'split-epub-0100' of https://github.com/mgylling/epub-testsuite into split-epub-0100
Reorganized some tests to accommodate testing website

Put all direct children of a category at the top of the list instead of
having it interspersed.
Corrected wording

front.xhtml document now contains the correct document title and ID.
fixed a nav link

Accidentally pasted the new ID in the wrong element. This corrects it.
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.
Fixed MO reference error
Merge branch 'master' into split-epub-0100

merging marisas split