pgsql: Easier to translate psql help Instead of requiring translators

Log Message:
-----------
Easier to translate psql help

Instead of requiring translators to translate the entire SQL command
synopses, change create_help.pl to only require them to translate the
placeholders, and paste those into the synopsis using a printf mechanism.
Make some small updates to the markup to make it easier to parse.

Note: This causes msgmerge of gettext 0.17 to segfault. You will need
the patch from https://savannah.gnu.org/bugs/?27474 to make it work.
msgmerge usually only runs on babel.postgresql.org, however.

Modified Files:
--------------
pgsql/doc/src/sgml/ref:
alter_database.sgml (r1.22 -> r1.23)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/ref/alter_database.sgml?r1=1.22&r2=1.23)
alter_function.sgml (r1.17 -> r1.18)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/ref/alter_function.sgml?r1=1.17&r2=1.18)
alter_role.sgml (r1.12 -> r1.13)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/ref/alter_role.sgml?r1=1.12&r2=1.13)
alter_table.sgml (r1.108 -> r1.109)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/ref/alter_table.sgml?r1=1.108&r2=1.109)
alter_user.sgml (r1.45 -> r1.46)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/ref/alter_user.sgml?r1=1.45&r2=1.46)
begin.sgml (r1.37 -> r1.38)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/ref/begin.sgml?r1=1.37&r2=1.38)
create_domain.sgml (r1.32 -> r1.33)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/ref/create_domain.sgml?r1=1.32&r2=1.33)
create_group.sgml (r1.19 -> r1.20)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/ref/create_group.sgml?r1=1.19&r2=1.20)
create_role.sgml (r1.11 -> r1.12)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/ref/create_role.sgml?r1=1.11&r2=1.12)
create_table.sgml (r1.115 -> r1.116)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/ref/create_table.sgml?r1=1.115&r2=1.116)
create_user.sgml (r1.41 -> r1.42)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/ref/create_user.sgml?r1=1.41&r2=1.42)
fetch.sgml (r1.43 -> r1.44)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/ref/fetch.sgml?r1=1.43&r2=1.44)
grant.sgml (r1.75 -> r1.76)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/ref/grant.sgml?r1=1.75&r2=1.76)
lock.sgml (r1.52 -> r1.53)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/ref/lock.sgml?r1=1.52&r2=1.53)
select.sgml (r1.124 -> r1.125)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/ref/select.sgml?r1=1.124&r2=1.125)
set_transaction.sgml (r1.26 -> r1.27)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/ref/set_transaction.sgml?r1=1.26&r2=1.27)
start_transaction.sgml (r1.17 -> r1.18)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/ref/start_transaction.sgml?r1=1.17&r2=1.18)
pgsql/src/bin/psql:
Makefile (r1.65 -> r1.66)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/bin/psql/Makefile?r1=1.65&r2=1.66)
create_help.pl (r1.19 -> r1.20)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/bin/psql/create_help.pl?r1=1.19&r2=1.20)
help.c (r1.151 -> r1.152)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/bin/psql/help.c?r1=1.151&r2=1.152)
nls.mk (r1.23 -> r1.24)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/bin/psql/nls.mk?r1=1.23&r2=1.24)