Actually this leaves out the case of the SQL schema not consistent with the
library/binary installed, and this is a relatively likely case:
the user has run "make install" but the repack schema was already loaded
from an older version.
repack_all_database can return an error message: in case of any error different
from "missing schema" return the error and keep processing the other databases
instead of printing and stopping the program.
The output of the program is now something like:
$ pg_reorg --all
pg_reorg: reorg database "contrib_regression"
pg_reorg: reorg database "template1" ... skipped: pg_reorg is not installed in the database
Provide only CREATE EXTENSION support on PG >= 9.1 and only the sql script on
PG < 9.1.
Also dropped the /echo cruft in the extension script: it is broken on pg 9.1
and 9.1.1, and because the script is not installed on versions that don't
support CREATE EXTENSION it is just not terribly useful.
