Limit the angular subtension of a letter

[rossjrw]

An angle is drawn as if it were on account of some quirk in the radial renderer. With the new organic algorithm, this doesn't really matter for phrases, but for letters it does:

The letter is too small.

The easiest thing to do is to limit the angular subtension of a letter. This should only be invoked when there is only one letter in a word, so it shouldn't cause any problems, hopefully. In this example, a d-block letter should be huge and dominate that word.