lib/runscripts/table.run: don't mk_esc_name schema, table because these will be mk_esc_name'd by functions that use them

lib/sh/local.sh: psql(): use $schema_esc, $table_esc instead of just putting $schema, $table in ""

lib/sh/db.sh: mk_esc_name_alias(): don't overwrite an already-defined $*_esc, to allow the user to provide an already-escaped value (such as a schema-qualified table) directly

lib/sh/util.sh: rtrim(): increase the log_level of sed to 4+ instead of 2+ because it is usually run as part of a var assignment, and should therefore have a lower log_level than echo_vars

lib/sh/db.sh: mk_esc_name_alias(): echo_vars the *_esc var when it's set

lib/sh/db.sh: added mk_esc_name_alias() and use it to create mk_schema_esc, mk_table_esc

lib/sh/db.sh: mysql(): run with --local-infile=1

bugfix: lib/sh/db.sh: log_sql(): use can_log() instead because the verbosity now gets decremented as the log_level increases, so the threshold to compare to is 0 instead of 2

lib/sh/util.sh: added set_default()

lib/sh/util.sh: rtrim(): run at higher log_level so that sed command is not normally echoed