Renamed some tests, introducing subsidiary directories
for fb2, docx, epub.
Cleaned up tests in cabal file.
Combined dokuwiki-writer and dokuwiki_inline_formatting tests.
We want to treat it as a plain paragraph if the hanging amount is
greater to or equal to the left indent---i.e., if the first line has
zero indentation. But we still want it to be a block quote if it starts
to the right of the margin. Someone might format verse with wrapping
lines with a hanging indent, for example.
