[kronolith] Bleeding day-long events

[Brian Keifer]

Hi, list.

I'm using Kronolith (HEAD) and am noticing that an all-day event on the
second-to-last day of the month also shows up on the last day of the month. 
This happens on the month and week views;  the day view isn't affected.

I took a look at the code but couldn't quite wrap my head around it, so if
someone out there who's a bit more familiar with it has some time, it's all
yours. =)

Thanks!