schemas/util.sql: added text[] => text operator, analogous to text => text for multiple keys (uses hstore(keys text[], value text))

schemas/util.sql: added hstore(keys text[], value text), which can be used to avoid repeating the same value for each key. there are many /_map filters which use the XPath syntax for doing this, which now need to use an equivalent SQL syntax to avoid duplicating the value many times.

web/links/index.htm: updated to Firefox bookmarks. added link to Brian Enquist's fractals video on PBS NOVA.

schemas/util.sql: added array_fill(anyelement, integer), which doesn't require lengths for multiple dimensions

schemas/util.sql: added array_length(anyarray, dimension integer) wrapper, which returns 0 instead of NULL for empty arrays

schemas/util.sql: added array_length(anyarray), which does not require a second dimension argument

lib/sql_io.py: put_table(): documented that PostgreSQL 9.1+ now provides a way to implement insert/on duplicate select just once for each table (instead of dynamically for each insert) using the new INSTEAD OF triggers (http://www.postgresql.org/docs/9.1/static/plpgsql-trigger.html). INSTEAD OF triggers were not used when put_table() was developed, because it was necessary to support PostgreSQL 9.0, which was installed on the Mac and not easily upgradeable. it was eventually upgraded to add PostGIS, which required a complete reinstall of the DB from the staging tables, with the associated staging table reload bugs, as well as complete removal of the old Postgres version.

inputs/Madidi/: switched to new-style import

schemas/VegCore/VegCore.ERD.mwb: regenerated exports

schemas/VegCore/VegCore.ERD.mwb: categories: fixed position of place to match where it now is in the diagram. lined up boxes so that there is a visible line between the place- and occurrence-related categories.