iNat and source support

Added support for external links to iNaturalist.
Added preliminary support for accepted name source in citation
cross-references.
GBIF support

support for external links to GBIF
Summary graphs

Created a new page with graphs summarizing the citation database
Name graphs and fixes

Cleaned up some of the reference graph code. Added the name summary
graph code. Cleaned up the output for specific name pages when data is
missing.
References per Species graph

Added a graph showing # of references to each species.
Also fixed a few bugs.
Sources

Added output of source for accepted names.

Also cleaned up a few of the output fields when the data was unknown or
to be determined.
New webpage release

Official release of new webpages, with updated data, graphical
summaries, sources of accepted names, links to external sites, etc.