mappings/VegCore.csv: Added and mapped aggregateOccurrenceID

mappings/VegCore.csv: taxonOccurrenceID: Re-sourced to VegBank taxonobservation and DwC occurrenceID, because this is where the VegBIEN table name came from

tnrs_client: Support parsing multiple taxons at once, by specifying each as a command-line argument. Increased the max_pause to 10 min to support large batches. Limited the batch size to 5000 names, using the limit at <http://tnrs.iplantcollaborative.org/TNRSapp.html&gt;. Note that when using xargs to pass many names, xargs will by default split its arguments into chunks of 5000. You can change this using the -n option.

inputs/import.stats.xls: Updated import times

Added tnrs_client. Note that obtaining an actual CSV requires four (!) steps: submit, retrieve, prepare download, and download. The output of the retrieve step is unusable because the array has different lengths depending on the taxonomic ranks present in the provided taxon name. This initial version runs one name at a time, but could later be expanded to batch process because TNRS can run multiple names at once.

streams.py: Line iteration: Added read_all()

inputs/Madidi/Plot/map.csv: Soil component measurements: Documented that units are assumed to be % based on the range of values

sql_io.py: null_strs: Added '-'

sql_io.py: cleanup_table(): Fixed bug where each column name needed to be converted to Unicode before being concatenated with other strings, to support non-ASCII characters

inputs/SALVIAS/plotMetadata/map.csv, inputs/SALVIAS-CSV/Plot/map.csv: Soil component measurements: Documented that units are assumed to be % based on the range of values