Listing module (Auflistung) has problem with expression in column list and where clauses

(3.1.4)
When using an expression like

company,concat(lastname,', ',firstname) as "Name",city,phone

in the list_info field, column headings are incorrect.

Caused in mod_listing.php - splitting the field list on commas fails here.
Solution: move THEAD code after TBODY code and use the column names actually returned by the query.

Note: A virtual column (like Nameabove) can still not be used in the query mask.
Solution: rewrite SQL generation for this case (subquery).

Also, inserting a condition like

1=1 OR 1=0

into the list_where fields results in wrong results as soon as a query mask ist added (the query mask condition is ignored). Any OR condition goes wrong.
Cause: the query mask condition is appended by AND, resulting in

1=1 OR 1=0 AND condition

which is TRUE always. It should read

(1=1 OR 1=0) AND condition

Same for list_info_where

I have already fixed the issues here and in #6338, and I am working to include #6332. After proper testing, I just will have to learn a bit more git to make the pull request.

[leofeyer]

I'm closing the ticket in favor of #6344 then.