Can now use 'contains' to query individual columns in where() queries, not just any: contains.
Merge branch '1977-provenance-report' of git.clinicalfuture.com:arvados into 1977-provenance-report

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* Added used_by query for collections
* Fixed svg div javascript/layouts after Tom's changes
* Added hover css effect for graph lines
* Added graph to pipeline instance comparison page
Merge branch '1977-provenance-report' of git.clinicalfuture.com:arvados into 1977-provenance-report

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Added stroke-linecap: round to make lines look nicer.