if 2D geometry provided, ask user to provide elevation or query from public API

[dlebauer]

Currently it appears elevation is set to 115 by default https://github.com/PecanProject/BETYdb-YABA/blob/31d62873a9d3e4a5fd2bc7dae8bdacf0ffebefa0/app/Meta.py#L140

• [ ] Short term fix - set to 0 by default
• [ ] Potential fix:
  • Better fix: ask user
  • Best: use lat/lon to query elevation from public API

[eshantri]

@dlebauer I'd like to work on this issue, I would try to fix this by using the best method you described i.e to query from public API.