New layout of the calendar for the time fields #45

@gregrickaby please check if it is nice, I applied to all wordpress admin themes
I think I prefer the before version.  The altered version visually is nicer - just having the month name at the top instead of a dropdown is visually more appealing, but my concern is that average users won't realize that you can key in a date manually into the input and will page back or forward for minutes trying to get to the month & year they're looking for.

Since the calendar pops up once you click inside the field, I think the average user would think that you NEED to use the calendar to select the date rather than typing it and it could be frustrating if they think they need to spend time clicking the back arrow to get to October of 2010, for example.