[dataimport] Properly escape strings sent to COPY FROM (closes #5278743)
See http://www.postgresql.org/docs/9.1/static/sql-copy.html#AEN64296
for escaping codes.
option_group_changed('port', 'main', 'web')
option_group_changed('query-log-file', 'main', 'web')
option_group_changed('profile', 'main', 'web')
option_group_changed('max-post-length', 'main', 'web')