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.

bin/map: removed no longer used support for map.csv input column prefixes (expand out the prefixes instead). this used to be used by SpeciesLink to use just one mapping for a single term with multiple DwC namespaces, but was replaced with an explicit, ordered rather than implicit, unordered /_alt-ing together of the terms.

bin/map: removed no longer accurate comment that this is case- and punctuation-insensitive, since the case- and punctuation-insensitivity is now instead handled by map.csv preprocessing scripts before the mappings are even provided to bin/map

inputs/.herbaria/: switched to new-style import, which renamed the columns to the VegCore names. this is done using the commands at wiki.vegpath.org/2013-06-27_conference_call#To-do-for-Aaron > "run the following for each datasource".

lib/sql_io.py: cleanup_table(): don't run the slow ALTER TABLE statement again if the table has already been cleaned up. documented that it is idempotent (and actually was before this change as well).