Feature/date scripts

This includes the code from #2161 

This adds a link to the script fields listing that will populate a bunch of example date scripts for each date field, including:

```
__minuteOfHour
__minuteOfDay
__hourOfDay
__dayOfWeek
__dayOfMonth
__dayOfYear
__weekOfMonth
__weekOfYear
__monthOfYear
__quarterOfYear
```

It also adds a handy-dandy whirlwind intro to scripting to the scripted field creation page.