GitLab

The existing SQL tests are now all assigned to the "sql" group, and a
subset are also now assigned to the "hw2" group if they should be
supported by the SimplePlanner.

The Maven pom.xml is also updated to include the "hw2" tests.

A number of correctness tests are contained in the TestHeapTableFormat
class.  The tests are activated in the Maven test configuration.

Updated the nanodb script to properly handle being run under Git Bash.
Needed to wrap the Java program with "winpty" when starting it from Git
Bash.

Also updated the Surefire configuration to not require all tests to pass
before building a JAR file.  There are a few tests that aren't working
on Windows due to file-locking differences from *NIX.