Handle default column values outside CREATE TABLE
Handle column comments

Put them together with the table groups.
Fix foreign keys on own table being put in _misc
Load cross-schema deps on new step; handle views

Views are put in separate files in a views/ folder and now have their
dependencies detected, though not from regexing their definitions
(this would be too error-prone without sophisticated SQL parsing).
Instead pg_depend is used for them.

A new target, load_cross, is added to load the cross-schema parts.

The DDL dumping process also changed a bit. Instead of creating files
named full_$SCHEMA.sql, the contents of those files go to
_dumps/$SCHEMA.sql. Also put inside _dumps/ is the data obtained
through pg_depend, one per schema, which contains information about
the views' dependencies in that schema.
Dump DDL in new format (separated views/x-schema)