0.9.27-beta

• added verification checks for LWN header
• changed "sequence" to "seq" in checkpoint file - you might need to update manually json checkpoint files
• fixed bug: incorrect con length read from schema file
• added some tracking debug info
• added check for ignoring binary objects (like xmltype, object)
• removed debug table from output (to make testing easier)
• removed warning for 11.2 during ALTER TABLE ADD COLUMN with DEFAULT
• fixed bugs related to checkpoints
• fixed bug: sending checkpoint messages for already confirmed SCN