Make available also SRTM 1" on LoMaps

[lor74cas]

I downloaded the map of northern Italy from the locus store, together with the altitude files available. I noticed they have a detail of 3" even where the zones mapped at 1" are available.
It would be nice to have two links on the map page in the store, one with the 3" detail for those who don't want to take up too much space and one with the 1" for those interested in better accuracy.