Sequence needs brackets

In a multisite environment where we have the sequences table shared, I discovered an entry in that table for path_access which did not follow the convention of using the db/table name prefixes. This presents a problem because each site has its own path_access table but they share the sequence. The prefixes would resolve that issue, so the code needs patching to handle this correctly. I also appended "_pid" to the table name to give the sequence a more descriptive name.

I attempted to address the Postgres handling of the sequence too but I do not have PG, so hopefully someone can test this on the PG side. It worked for me under MySQL.

I have included patches for the install and modules files separately here. I hope that is acceptable. Thanks!