web/links/index.htm: updated to Firefox bookmarks: fixed broken links

bugfix: lib/util.py: use OrderedDict from collections rather than ordereddict to work with Mac OS X 10.8 Mountain Lion (http://vegpath.org/links/#OrderedDict)

/Makefile: apache-Linux: updated for Ubuntu 14.04, which includes Apache 2.4 in the distribution

/Makefile: install: documented that schemas/public/install also tests that a clean public schema will be installable by full-database import

/Makefile: install: skip the test step at the end because this is not needed for the installation (it can be run separately if desired)

bugfix: **/postprocess.sql: don't use the public schema, because this creates an unsatisfied dependency while the database is being installed, and breaks `make install`

schemas/public_.sql: _km_to_m(): made it a wrapper around util._km_to_m() so this function is only in one place

schemas/util.sql: added _km_to_m() for use when public._km_to_m() is not defined yet

bugfix: benign_does_not_exist_error(): removed ignore_e=3, because this exit status is also used for other errors

fix: lib/sh/db.sh: benign_does_not_exist_error(): use benign_error=1, which is now supported properly by stderr_matches()