(feat) #15 Add support for database schema setting

nfldb should be installable in a non-public schema if desired,
this commit sets the search_path for the cursor so that all queries
will be against the desired DB schema first and public second

Squashed commits:
(feat) Add support for database schema setting to config file
(feat) add a _PFX_ replacement mechanism for DDL
       Simple string replacement on all DDL in the db module to allow
       for explicit resource references in DDL updates
(fix) correct use of new conn tuple
(fix) bad call of pfx fixed
(fix) spaces do help