Summary Viz rounding!

Displayed values on Summary Viz can now be configured to round to an arbitrary number of decimal places.  I set it to three for all fields, although this can be easily changed if desired.  Values are only rounded to the desired number of decimal places if the value has more than that number of decimal places.  That is, rounding the number 1 to three decimal places will display 1, while 1.1234 will display 1.123.

Addresses issue #1559