The output of \thesis@block@assignment and \thesis@@{assignment} now
depends on the value of the new \ifthesis@digital@ conditional.

Also removed a largely useless section from the guide.

When UPDATE_FAILED=true, failed tests will update the prototype PDFs
instead of terminating the procedure.

The tocdepth now uses the standard numbering (\part has tocdepth of -1).
Added a visual test suite.

\MakeUppercase is now disabled in PDF text, which fixes the \part error.
\tableofcontents folding now works as indended for -1 <= tocdepth <= 4.

Removed \paragraph entries for tocdepth>4.
Chapter entries are vertically spaced for tocdepth>1.