#1740 log OOM to console

improve database not found error

Quote identifiers in persisted SQL unconditionally

so we can distinguish between the situations where a database doesn't exist, but should, and the situation where we could auto-create a database, but can't because of security

Improve isSimpleIdentifier() and enquoteIdentifier()

Improve DATABASE_TO_LOWER handling

Fix NPE in TableFilter.createIndexConditions()

Fix newlines in test scripts

Delay creation of index conditions for ON conditions to avoid NPE

Add more context-sensitive keywords

Use Sequence.flush() in AlterSequence to avoid concurrent update exception

Fix concurrent deletion handling in SELECT FOR UPDATE

Assorted changes