Table with attribute

In Table rule we have a variant to create a Table object from a Tuple of parameters for the columns:

( 'Table' with_attr ?= 'with' 'columns' '=' columns_tuple = Tuple ) | ( '(' columns += Series[','] ')' )

Problems:

• 'with_attr' is used nowhere
• 'columns_tuple' is used only in typechecks.py::table_type() to fill columns list

The rule can be much more simple like this

'Table' 'with' 'columns' '=' ( '(' columns += TableColumnParameter[','] ')' )

TableColumnParameter:
  Series | VarReference
;

Then we do not need 'with_attr' and 'columns_tuple' and the typechecker typechecks.py::table_type() then does not do any copying. And all existing programs/tests will still work.