web/links/index.htm: updated to Firefox bookmarks: PostgreSQL: added explanation of the difference between STABLE and IMMUTABLE, and common pitfalls in using IMMUTABLE when you should use STABLE. svn: added troubleshooting steps for running `svn upgrade` after the last Mac system update, which upgrades svn.

fix: schemas/util.sql: diff(text, text): use util.typeof() instead of pg_typeof() so the outputted query is runnable in any search_path

schemas/util.sql: added typeof(), which unlike pg_typeof() uses util.qual_name() to create a search_path-independent name

fix: schemas/util.sql: quote_typed(): schema-qualify the type so the expression does not depend on the search_path

schemas/util.sql: %== : use custom keys() function for the type, so that the user only has to get the keys from their value, not also write the comparison of those keys

schemas/vegbien.sql: synced from DB, which changes the order of the ~type tables

schemas/util.sql: diff(regclass, regclass): support custom %== by including the col_type_null's schema in the search_path

schemas/util.sql: debug_print_return_value(): don't '-encode the value by default, because text values usually look better without the '-escaping

bugfix: schemas/util.sql: mk_set_search_path(): debug_print_return_value() needs to be on mk_set_search_path(text), not mk_search_path(VARIADIC text[])

schemas/util.sql: mk_search_path(): use debug_print_return_value() because this function is used with EXECUTE rather than util.eval() (in order to affect the calling function), so the search_path would not otherwise be printed