web/links/index.htm: updated to Firefox bookmarks: removed dead links

web/links/index.htm: updated to Firefox bookmarks: updated favicons

web/links/index.htm: updated to Firefox bookmarks: modifying a running shell script: updated to document that `svn up` actually does use two-stage save automatically

web/links/index.htm: updated to Firefox bookmarks: PostgreSQL: added operator classes. added backups: filesystem-level backup, continuous archiving, WAL logging, etc. virtual collaboration: updated annotations.

bugfix: web/.phpPgAdmin/.htaccess: work around phpPgAdmin bug that causes page to be ignored when not logged in

web/.phpPgAdmin/.htaccess: extract path components 1st->last: documented that can't use subject param for this because that goes to the last selected tab, not the default (leftmost) tab

*{.sh,run}: runscript targets: use begin_target instead of echo_func so the target name is properly echoed. note that this requires using with_rm so that $rm is properly progagated to applicable invoked targets. (previously, $rm was progagated to all invoked targets. note that with_rm only works inside a runscript target that starts with begin_target.)

web/links/index.htm: updated to Firefox bookmarks: Firefox: added instructions for enabling security.password_lifetime and making all tabs load when the browser is opened

web/links/index.htm: updated to Firefox bookmarks: Google Drive: listed bugs that make it very difficult to use (the need to re-download all files when reconnecting a client to an account). added recommendation not to use it (unstable).

web/links/index.htm: updated to Firefox bookmarks: PostgreSQL: query planner: documented how to prevent incorrect query plans (`SET enable_seqscan = off;`, etc.)