Making GroupBy value aware
Partially revert 65bc666

* Removes accidental changes from earlier commit
Add basic server testing to ci tests
Merge pull request #197 from bastih/master

Partial revert, add server tests for CI
Remove unused variable
Prevent dangling else-warning
Fix warning in groupby tests
Add a meaningful message for join types
Modernize JoinScan
Merge pull request #202 from bastih/master

Some small cleanups
adds function for parameterized loading of (json) files
allows SortScan to order by column name (and still by column number)
adds function for parameterized loading of (json) files
allows SortScan to order by column name (and still by column number)
executeAndWait now support setting trasactionID
new tpcc test tables, and almost complete Delivery Test
[wip] more trasaction tests implemented