Linebreaking "thirteen"

[pzich]

I really appreciate having the source for this, as it let me make my own little tweaks (like adding an "oh" for minutes under 10 and putting the date somewhere), but I thought I'd point out that the Text Watch on the watch doesn't break for the word "thirteen". I solved this by adding an && minutes != 13 onto line 117 of num2words-en.c, but there's probably a cleaner solution to it.