Query: Determine omitted & target columns correctly

[yhabteab]

Excluding a column from a query/model that also contains expression columns fails as follows: I originally noticed this when working on Icinga/icingaweb2-module-nagvis#61 where I wanted to exclude some columns from the ServicestateSummary model that were causing a PostgreSQL grouping error, but you can also easily trigger this in Icinga DB Web by adding $servicegroupss->withoutColumns(‘id’); in ServicegroupsController for example.

[nilmerg]

We now know that expressions cause problems here, why not support them properly?

In case with() or without() is called with an alias of an expression, I'd expect the expression should be included/excluded (respectively).