inputs/VegBank/: mapped stratumtype

/README.TXT: Datasource setup: additional steps for new-style datasources: added steps not present in http://wiki.vegpath.org/Adding_new-style_import_to_a_datasource because they were performed all at once for all datasources

/README.TXT: Datasource setup: added additional steps for new-style datasources, from http://wiki.vegpath.org/Adding_new-style_import_to_a_datasource

bugfix: schemas/vegbien.sql: taxondetermination_set_iscurrent(): is_datasource_current: accept any determinationtype other than the TNRS ones (accepted, matched), so that datasources that provide a custom value for this field (such as VegBank) don't have their taxondeterminations incorrectly treated as non-datasource. this fixes the VegBank bug where datasource taxondeterminations were not being joined on in analytical_stem_view, because the join included a filter for only datasource taxondeterminations, but these taxondeterminations were not being properly treated as such. this should fix the missing taxonomic information in the VegBank validation extract.

inputs/VegBank/taxonobservation_/map.csv: taxonomic ranks not in VegCore: removed table prefix so they will be automapped (they are globally unique)

planning/timeline/timeline.2013.xls: updated for progress

planning/timeline/timeline.2013.xls: updated as decided in the conference call

inputs//: don't import joined tables, because they are now imported in the taxon_observation.** left-join instead

inputs/VegBank/taxon_observation.**/postprocess.sql: run mk_subset_by_row_num_func() to add a subset function that uses sort_col. this is used by column-based import, and also provides a common subsetting/sorting API for all the left-joined views. test.xml.ref: the inserted row count most likely changes because the sort order changes.

schemas/util.sql: added mk_subset_by_row_num_func(regclass), which uses a sort_col instead of a row_num column