Find out total download and final database sizes

[derekeder]

Once we get all of our datasets added, it would be good to tell the users some useful stats on the readme:

• total download size of all files
• total size of the postGIS database footprint

[mccc]

We can figure out a lot of the aggregate download size via wget --spider, which will make it to the file and spit out the size without downloading it. PostGIS footprint size will be some more tricky postgres command.

[derekeder]

in the downloads folder, use

du -sh .

to determine size of downloads once we have everything added

[mccc]

\l+ will show each database's size in MB from the psql shell.