This commit also add some "magic" comments to existing tests so they
render correctly. Note that some older commits predates these "magic"
comments, which is why they are not there.
This will avoid some copy/paste in future tests.
The commit also fixes a typo and a missing --DOC_NO_DASH which breaks
rendering with one of the markdown implementation.
This adds require("_date") to some example tests that use the current
date via os.date. This allows reproducibility by replacing os.date()
with a function that uses a static date from $SOURCE_DATE_EPOCH. See
commit 9d7eaf0 for more details.
Signed-off-by: Uli Schlachter <psychon@znc.in>