pgsql: Give a more user-friendly error message in situation where CREATE

Open items list updated for this fix and previous tablespace fix, and
new TODO item added:

* Allow a database in tablespace t1 with tables created in tablespace t2
to be used as a template for a new database created with default
tablespace t2

All objects in the default database tablespace must have default tablespace
specifications. This is because new databases are created by copying
directories. If you mix default tablespace tables and tablespace-specified
tables in the same directory, creating a new database from such a mixed
directory would create a new database with tables that had incorrect
explicit tablespaces. To fix this would require modifying pg_class in the
newly copied database, which we don't currently do.

---------------------------------------------------------------------------

Tom Lane wrote:

Log Message:
-----------
Give a more user-friendly error message in situation where CREATE DATABASE
specifies a new default tablespace and the template database already has
some tables in that tablespace. There isn't any way to solve this fully
without modifying the clone database's pg_class contents, so for now the
best we can do is issue a better error message.

Modified Files:
--------------
pgsql/src/backend/commands:
dbcommands.c (r1.144 -> r1.145)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/commands/dbcommands.c.diff?r1=1.144&r2=1.145)
tablespace.c (r1.11 -> r1.12)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/commands/tablespace.c.diff?r1=1.11&r2=1.12)
pgsql/src/include/commands:
tablespace.h (r1.5 -> r1.6)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/commands/tablespace.h.diff?r1=1.5&r2=1.6)

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