HSQLDB apparently requires a default value when a column is marked NOT NULL and already exists

Change Set changelogs/db.changelog-1.1.xml::denormalize-statuses failed.
Error executing SQL ALTER TABLE FEEDENTRYSTATUSES ADD user_id BIGINT NOT NULL
default expression needed in statement [ALTER TABLE FEEDENTRYSTATUSES ADD user_id BIGINT NOT NULL]
pgSQL rejected the update lines in populate-status-xxx change sets

Error executing SQL update FEEDENTRYSTATUSES s SET s.entryUpdated = (select e.updated from FEEDENTRIES e where e.id = s.entry_id):
ERROR: column "s" of relation "feedentrystatuses" does not exist
For some reason, liquibase was rejecting denormalize-statuses changeset

It failed validation due to missing checksum.
Merge pull request #432 from MageFroh/db-fix

Fix a few issues related to recent database changelog updates