Update test.html for commit 97eb1bce
Update unit test for commit 97eb1bce
Add unit test for remove-br-before-blocks
Less-stupid implementation of remove-br-before-blocks.

Faster. Also better result: Items omitted rather than replaced by "".
Provide/document `current-show-linkrefs-as-footnotes?` parameter.
Support all nuances of links and reference link definitions.
Fix error in README: `code` not `pre`.