#1 upgrade installs fail when pgsql is running

[Andy Satori]

The installer doesn't shut down the existing instance of
PostgreSQL and therefore fails to overwrite the files.

This should check for the presence of postmaster, and if
possible run a check to verify the version. If a major version
change is needed, then the system should prevent the
installation, and prompt the user to run a full backup of the data
for conversion.

[Andy Satori]

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Adding a check to the installer package to prevent installation when a
previous copy is running. Also adding verbage to encourage users to
run a backup of existing databases in to prevent data loss in an
upgrade.

[Andy Satori]

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The installer script has been updated, and is going into CVS tonight.
The fix will be a part of the 8.0.1c release.