Move HTML tests to directory /html-test/

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+This is a testsuite for Haddock that uses the concept of "golden files". That
+is, it compares output files against a set of reference files.
+
+To add a new test: 
+
+ 1) Create a module in the "tests" directory.
+
+ 2) Run "cabal test". You should now have output/<modulename>.html. The test
+    passes since there is no reference file to compare with.
+
+ 3) To make a reference file from the output file, do
+      runhaskell accept.hs <modulename>
+
+Tips and tricks:
+
+To "accept" all output files (copy them to reference files), run
+  runhaskell accept.hs
+
+You can run all tests despite failing tests, like so
+  cabal test --test-option=all
+
+You can pass extra options to haddock like so
+  cabal test --test-options='all --title="All Tests"'
+