lib/util.sh: log_stderr_cmd (): replaced the `|| exit` after the () with `|| return`, for the same reason that this was a problem for extern () (see r8954)

lib/util.sh: extern (): replaced the `|| exit` after the () with `|| return`, because `|| exit` strangely does not use $? as its exit status (even though `|| exit $?` works fine). in a shell function, it is actually sufficient, for errexit purposes, to use `|| return`, because the exit status is checked upon return from the function. it is in fact preferable to use return rather than exit, because then the caller can catch the exception using `|| true`.

lib/util.sh: extern (): removed the `|| exit` inside the (), because this strangely prevents the exit status from being propagated to the exit status of the ()

lib/util.sh: added explicit `set -o errexit` in case caller did not have -e in #! line

inputs/GBIF/table.run: renamed MySQL_export () to export_mysql () to match schemas/VegCore/VegCore.ERD.mwb.run

inputs/GBIF/table.run: renamed MySQL_export () to export_mysql () to match schemas/VegCore/VegCore.ERD.mwb.run

inputs/FIA/_archive/2011-10-17/: set svn:ignore to *

web/links/index.htm: updated to Firefox bookmarks. added Mac upgrade and recovery-related bookmarks.

bugfix: lib/import.sh: remake_VegBIEN_mappings (): don't run if there is no public schema to perform the test on (e.g. if the staging tables have just been reinstalled)

lib/import.sh: added public_schema_exists (), which just calls psql_script_vegbien (i.e. with the default search_path temp, public, etc.) and sees if returns an error