Autocommit and TransactionIsolation Support for Transactions

[vnayar]

This is preparatory work before higher level transaction support can be added to HibernateD.
The function names and types used are based on https://docs.oracle.com/javase/8/docs/api/java/sql/Connection.html

Tests were expanded and a few uncaught bugs in the implementation of setAutoCommit were found and fixed.

The included .editorconfig is a copy of the file from HibernateD.

[SingingBush]

looks good to me. The ddbctest/main is getting rather large so may be worth splitting into multiple files for different kinds of tests. That doesn't have to be done now though. I'm happy to merge if the writeln can be changed to use standard logger