Update feature info precision

[rowanwins]

From Matt Garthwaite

I am just exploring the data as represented in National Map. When clicking a pixel, the values for the four styles are displayed as in the below screen shot. Is it possible to limit the precision of the numbers displayed? For these particular InSAR data sets it does not make much sense scientifically to display anything beyond a tenth of a millimetre (i.e. can you only display 1 decimal place?).

https://github.com/TerriaJS/NationalMap-Catalog/blob/master/datasources/includes/NSW.ejs#L75-L164