#172 query Builder: add "sync columns with select" for group by

[PAscal]

group by columns should be "sync with select columns" after each change on query

[PAscal]

group by
should take all columns and functions/ operations
that are not aggregate functions ( count, sum, avg, min, max )

exemple:
select 1, f(a), 'gg', count(*) from
group by 1, f(a), 'gg'