Allow translation from parsers other than MySQL, Pg, and Oracle and just

Allow translation from parsers other than MySQL, Pg, and Oracle and just
set up table more manually than using the "set_up_table" method; no reason
to accept "$data" at beginning as it's not being sent anymore; no
longer using "$USER" or "$PASS" as they were only used once; removed
Class::DBI::Join as Michael Schwern (the module maintainer and Author
Emeritus of Class::DBI) says that Class::DBI handles this fine now
that this extra module will be leaving CPAN soon;  only create PK
accessor method if a callback was installed for it;  use
"$table->primary_key" to get PK rather than running through the
constraints to find it;  delay creation of output for each table until
after we've gone through everything so we can better set up the
"has_a" and "has_many" relationships;  intuit "has_many" as the
reverse of "has_a";  cleaned up "link tables" section, but commented
out as I'm not sure if my addition of "has_many" code might not do the
same thing.