Template1 is copied to each new database you create. If you modify Template1 you
interfere with your ability to create a new blank database.
Later versions (7.2 I think) add a template0 that is a bare empty database and also
add the ability to define different databases as templates. So you could install the
basic OpenACS data model into a database called something like
"OpenACS_Template" and create a new openacs db with a command similar to
"create database my_openacs_site with template='OpenACS_Template'"