Create PSI-MI TAB 2.6 implementation

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The new PSI-MI TAB 2.6 should extend the current 2.5 with this 16
additional columns:

PSI-MI TAB 2.6

- expansion -> CV (spoke, matrix, none, bipartite)
- biological role A
- biological role B
- experimental role A
- experimental role B
- interactor type A
- interactor type B
- xrefs A
- xrefs B
- xrefs Interaction
- Annotations A
- Annotations B
- Host organism taxid
- parameters Interaction
- dataset
- Caution Interaction

Original issue reported on code.google.com by brunoaranda on 3 Jun 2009 at 12:52