Redesign the model for asynchronous ingest of tabular files in 4.0

[eaquigley]

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Author Name: Leonid Andreev (@landreev)
Original Redmine Issue: 3527, https://redmine.hmdc.harvard.edu/issues/3527
Original Date: 2014-02-03
Original Assignee: Elda Sotiri

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This is NOT for 4.0alpha1;
Design a new model for async ingest framework.
Specifically, review alternatives for the message-based model currently in use in 3.*.

Gustavo and I will meet to discuss this.

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Related issue(s): #28
Redmine related issue(s): 3435

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[eaquigley]

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Original Redmine Comment
Author Name: Leonid Andreev (@landreev)
Original Date: 2014-04-11T02:57:54Z

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This functionality was not working properly for the last couple (?) of days, after the dataset page was modified to go through file metadatas to list the files - instead of going from dataset to datafiles directly.
I've committed some code earlier today that fixed it, so this should be ready for QA.

[eaquigley]

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Original Redmine Comment
Author Name: Elda Sotiri (@esotiri)
Original Date: 2014-04-16T21:02:56Z

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seem to work ok now.