SEEK

Need to be able to access data sources from EcoGrid from within the AMS. So,
from within AMS (vergil) need to be able to search EcoGrid to find candidate
data products, and then bind those data sources to the inputs of partially
constructed pipelines. Eventually, we want to be able to have the pipeline
drive the query (e.g., from the port types), but for now the user could specify
an EcoGrid query to identify the data needed.

To close this bug:
1) Design a system to query and expose EcoGrid data in the workflow editor
2) Implement this system in conjuntion with the EcoGrid team