Removed precision option. Objectives only works.

Precision option redundant now that input strings are written
back to output.

--print-only-objectives had been broken but is now working
Use input delimiter as output delimiter
Remove precision option

Not needed now that we're reproducing input verbatim
Clarified what epsilons are.
Added reference information
Fix links
fix link
Fix links
better link descriptions
Call out ReferenceSetMerger by name

It's a bit of a hidden feature.
Merge branch 'master' into testing