web/links/index.htm: updated to Firefox bookmarks: PostgreSQL: added description of join_collapse_limit config param (which should be turned off, although it is on by default). added links for using TIDs ("the fastest possible access to a single row").

web/links/index.htm: updated to Firefox bookmarks: PostgreSQL: added links for troubleshooting autovacuuming (which can slow queries down significantly when it isn't happening for any tables)

lib/Firefox_bookmarks.reformat.csv: "page's description": changed to "page's own description" to clarify that this is a description provided by the page itself

web/links/index.htm: updated to Firefox bookmarks: PostgreSQL: added links for error reporting levels and how to hide stack traces in psql. SQL: added links for recursive queries, which can be used to traverse hierarchical (parent-pointer) tables.

web/links/index.htm: updated to Firefox bookmarks: PostgreSQL: difference between STABLE and IMMUTABLE: functions that depend on the search_path: clarified that the confusing effects of using IMMUTABLE for one of these functions are only noticeable if the function is called on only constant values in a PL/pgSQL function (in which case the wrong search_path (the one in effect at create time) will be used)

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.

web/links/index.htm: updated to Firefox bookmarks: Roundtable: virtual collaboration: annotated the linked pages

web/links/index.htm: updated to Firefox bookmarks: Roundtable: added materials for virtual collaboration roundtable. Mac: added steps for customizing screen saver security settings beyond the options supported in the UI.

web/links/index.htm: updated to Firefox bookmarks: Unix: moved into OS folder. Windows: added steps to try for fixing Windows Update.

web/links/index.htm: updated to Firefox bookmarks: Redmine: added links to the REST API for exporting data. svn: added instructions for using svnsync to export a repository. PostgreSQL: removed duplicate pages that were linked for multiple versions of Postgres.