bugfix: added missing inputs/QFA/Specimen/header.csv

bugfix: inputs/TEX/Specimen/header.csv: generated from staging table (was empty previously)

bugfix: inputs/*/Source/map.csv: added missing row_num entry, which is needed by the staging table column renaming to make the order of the map.csv columns match the order in the staging table. the staging table column renaming is now used by all Source tables.

added inputs/newWorld/iso_code_gadm/header.csv

added inputs/analytical_db/table.run

bugfix: inputs/VASCAN/Taxon/map.csv: added missing row_num column added by bin/csv2db

lib/sql_io.py: cleanup_table(): added assertion that the table exists, so that if it doesn't, the error will occur as part of an assertion rather than as part of the util.table_nulls_mapped__get() call, which might confusingly lead users to believe that this is a bug in util.table_nulls_mapped__get() when in fact the problem is that the table is not installed

fix: inputs/import.stats.xls: removed spurious diff comment on total time, which only applied to the previous import

inputs/import.stats.xls: reformatted times longer than one day as a # of days instead of hours, for clarity. the days format is chosen automatically when the # hours exceeds one day.

bugfix: inputs/*/Source/: added missing ./run, which creates the new-style staging tables with the metadata fields as part of the table. this is needed now that these subdirs use installed staging tables instead of metadata-only map.csvs.