Node types need to be extended to support other assay types

[agbeltran]

Currently, as stated in the comments, the code is biased towards microarray and next-gen sequencing data. The nodes considered are those containing a "Raw Data File". This needs to be extended to support other assay types.

[chapmanb]

Alejandra;
Is there a particular set of records that is causing problems? Along with the fix for issue #1, I added support for collapsing around Derived Data Files if Raw are not present or identified. Hopefully this will help generalize it. Let me know if not.

[agbeltran]

Thanks. Support for Derived Data Files solves part of the problem. I believe Image File needs to be added as well. I will send you a dataset.

[chapmanb]

Alejandra;
Thanks for the example dataset and fixes. I checked this in at:

54ab6d9

and with issue #3 fixed we can parse your example dataset. Thanks again.