[Users] how to include a download button for downloadind a vector layer with lines/pol draw by user

[Phil Scadden]

As a matter of interest, after your users have saved the vectors to the 
local PC, then what? How are they going to use this data? My reason for 
asking is that can affect your strategy. JSON isnt the easiest format 
for reuse. If you used REST to save vector back to server, then you have 
option of downloading it as shapefile etc.

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