DOC: updated for the moving pictures tutorial 1.9.0 data

~~**NOT READY FOR MERGE**~~

Various updates, included collapsing all inputs into a single fastq file (which is a more common use case than multiple fastq files) and use of the ``--recover_from_failure`` option for ``core_diversity_analyses.py`` to add categorical analyses. 

Working on some strange clustering of samples - it's possible that I have some mislabeling here. 
The diff isn't allowing me to comment on the text above this command. The explanation still refers to multiple lanes -- can you please update?

Also note that there's a typo: *seperate* -> *separate*