Thanks, Tom.
>> Right, the real sequence when you are changing disk layout details is
>> pg_dumpall with old pg_dump and backend.
>> stop postmaster
>> rm -rf installation
>> make install
>> initdb
>> start postmaster
>> psql <pgdumpscript.
>>
>> You may want to do your development work in a "playpen" installation
>> instead of risking breaking your "production" installation with these
etc., etc.