lib/util.sh: echo_vars (): prefix the declare output with "+ " because it's actually a command, not just an indication of the var's value

lib/util.sh: added sed ()

lib/util.sh: added section labels

web/links/index.htm: removed broken favicons

web/links/index.htm: removed broken favicons. this requires using the SQLite Manager Firefox add-on <https://addons.mozilla.org/en-US/firefox/addon/sqlite-manager/?src=search> to manually remove the favicon entries.

lib/Firefox_bookmarks.reformat.csv: formatting fixes: don't put the src attribute of the favicon image on its own line, because it no longer contains long inline image data

lib/Firefox_bookmarks.reformat.csv: favicon image: remove ICON attributes with inline image data, since these are no longer needed for the favicon images and this avoids cluttering up the svn diff

lib/Firefox_bookmarks.reformat.csv: favicon image: use ICON_URI instead of ICON to fetch the favicon directly from the original site. this allows the favicons to be cached separately from the bookmarks page, so that the inline favicon contents don't need to be re-retrieved every time the bookmarks page is updated. this also avoids cluttering up the svn diff.

web/links/index.htm: updated to Firefox bookmarks. added description of the formats supported by PostgreSQL's COPY command and their escape sequences.

bugfix: schemas/vegbien.sql: geoscrub_input_view: only include places whose country is not NULL, because at least the country is required for geoscrubbing