Fix failing unit tests for 60d8de4.
Fixup XML formatting in job_conf.xml.sample_advanced.

Should fix the remaining failing unit tests.
Fix spelling error in API test.
Add some quick docs for creating dataset collections through API.
For full worked examples see bioblend and API tests.
Small clarification in previous doc addition.
Modifications to history_contents API and client consumption...

... to reflect the fact that history can now contain two kinds of objects with potentially overlapping ids.
Fix UI bug when collections and datasets in same history have same id.