schemas/util.sql: added copy()

schemas/util.sql: added copy_data()

fix: lib/tnrs.py: Constrain by Source: turn it on so that the download settings reflect what TNRS actually used, while this is broken

fix: lib/tnrs.py: max_names: reduced back to 500 because even 5000 crashes the dev TNRS server

lib/tnrs.py: max_names: reduced to 5000 because 100,000 causes an internal server error

bugfix: /README.TXT: Full database import: To run TNRS: to rescrub all names: also need to re-create public-schema views that were cascadingly deleted

/README.TXT: Full database import: To run TNRS: added steps to rescrub all names

backups/TNRS.backup.md5: updated

lib/tnrs.py: switched to downloading all matches per name, as is needed to implement #917. note that this will break the parts of the schema that use the tnrs table, until Brad's match-picking algorithm can be implemented, but this tradeoff is necessary to be able to begin scrubbing sooner (Martha; wiki.vegpath.org/2014-05-29_conference_call#TNRS)

schemas/vegbien.sql: tnrs_input_name: don't scrub accepted names, as using multiple matches per name no longer provides a single accepted name to scrub. instead, the Accepted_* fields can be whitespace-split to generate the same columns that would have been generated by the scrubbing (and without the overhead of the extra TNRS call).