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Allow users to download:
I've added a new button beneath the translator PGT display ("Export to JSON")
A click on the "Export to JSON" button calls client-side javascript, makeJSON(), which uses the existing /pgt_jsonbody server route to generate and return JSON.
Also added a checkbox near the 'Generate & Deploy Physical Graph' button ("Deploy")
The "Deploy" checkbox is checked by default and the functionality remains the same. However, if the user un-checks the "Deploy" checkbox, the 'Generate & Deploy Physical Graph' button will change to read 'Generate Physical Graph', and when the user clicks on the button, the physical graph will be downloaded as JSON.
A small change to the /gen_pg route in lg web was required to support this functionality. It checks the form submission for a field named 'dlg_mgr_deploy'. If found, the deployment part of the route will be skipped and a JSON response is generated.