Add vdebug logging for hints.

This hopefully helps with #225.
Add some logging for #152
Use QWebElement API to set hint elem attributes.

Fixes #225.
Use QWebElement API to set hint elem style.

See #225.
Set split=False for :quickmark-load.

See #231.

The completion still hides on the space and reappears on the first letter of
the second word, but it's a start.