load database config from the config file in preference to Constants.pm

load database config from the config file in preference to Constants.pm

add BSE::API::bse_init() to initialize the database (and anything else
that needs it in the future)

adjust Squirrel::{Table,Row} to not fetch the db handle until runtime

adjust command-line scripts to use bse_init.

adjust BSE::Request to initialize the db

make datadump.pl require a logged in user

make the regen code pass the config to the shop gen