Use setInerval for alert slider, instead of setTimer.

SetTimer sometimes fails intermittently; user tests showed setTimer worked without failing in the same timeframes as setTimer was.
hightlight/select add button on open reminder list window by default.

This was the old behavior but got lost at some point.  With this way, the Add button is highlighted when you open the reminder list window.
Change css to highlight/gray when hover over any calendar date, even those with reminders.

It was hard to tell when you were hovering over a reminder when there were many events listed on the calendar widget, as days were not highlighting on hover if they had an event on them.

Also disabled clicking a day on the calendar header to change the start date.  Several users had done that inadvertenly and couldn't figure out what had happened.  This is not a common operation so just having to set it via the options is reasonable.
housekeeping - add intellij file