CORE-1772 Informix cannot drop constraints
CORE-461 Wrong datatypes for timestamps generated with generateChangeLog
CORE-461 Wrong datatypes for timestamps generated with generateChangeLog
Make it easier to override default classLoader
UUID not worth the performance overhead for object identifiers
Performance improvements: scan all classes just once
When outputing data, stream data from database better and periodically flush file to decrease memory usage
CORE-1706 Excessive reading from databasechangelog table.

Re-introduced change log caching
CORE-1774 Autocommit not restored on close in SpringLiquibase
Support column values in value of node
CORE-1776 System-independent checksums