Move some tests in better place and add an additional test for 2PC

Fix Insert.prepareUpdateCondition() for PageStore

Fix some issues with NULLS FIRST / LAST

Parse and format TOP, INTERSECTS, and DUAL properly

#230: Renaming a column does not update foreign key  constraint

improve performance of planning large queries

not sure why my planning change triggers this change, but it's definitely an improvement

 Add tests for simple one-column index sorting

Assorted changes

Session.getTransactionId should return a more distinguishing value

#394: Recover tool places COLLATION and BINARY_COLLATION after tempor…

The newly introduced Transaction.sequenceNum is a better choice than Transaction.transactionId