Fix for issue #725: FilePathMem.tryLock() fails since Java 9

Use dummy FakeFileChannel as suggested by Noel Grandin to fix
memory and ZIP file systems.

Clean up LocalDateTimeUtils

Use StringBuilder instead of StringBuffer

DROP TABLE RESTRICT shouldn't drop foreign keys in other tables

Conversion methods provided by JDK are not used anymore for many reasons.

Assorted minor changes

This call is not required before close() and it will prevent closing of writer
if write fails for some reason.

Issue #638: Oracle mode: incompatible regexp back-reference syntax

Partial fix for #495

Add JdbcPreparedStatement.executeLargeUpdate() with implementation delegating to old internal method

Fix for issue #311

Better getObject error message

SecureRandom is already synchronized

Return properly encoded UUID from SimpleResultSet.getBytes()

When an unsupported type is passed to getObject(int|String, Class) the
error message always says that "java.lang.Class" is unsupported instead
of the actual type.