Disallow BLOB type in PostgreSQL mode

Move the list of things to be cleaned up down to Prepared.
Store the list as a list of TableView rather than Runnable, we don't
need that much flexibility.

issue#493 Query with distinct/limit/offset subquery returns unexpected rows

Support for full text search in multithreaded mode

we removed this a long time ago

# Conflicts:
#	h2/src/docsrc/html/changelog.html

required passing the Column down to Value#convertTo
Note that the test code in testscript.sql was pulled from maxenglander's
PR #572

typo in merge

and making them sort-of regular functions makes it easier to allow
overriding them

Charset collation

The charset collator allows sorting strings according to their binary representation in a given charset.

Refactor synonym implementation