[documentation] Fixes

We have, presently, objects for which documentation cannot be properly parsed (i.e., rendered in proper HTML via docutils), some as a result of #253 (closed). The solution in these cases, is to render a <pre></pre> formatted version of this documentation. This strategy is current adopted in websites like PyPI. So,

1. If documentation can be parsed, render it properly via HTML
2. If documentation cannot be parsed, render it in HTML with <pre></pre>.

This may make the fork work again, if the documentation of forked objects is bogus as reported in the mailing list.