reworking concept of column lists, "FromObject", "Selectable";

reworking concept of column lists, "FromObject", "Selectable";
support for types to be propigated into boolean expressions;
new label() function/method to make any column/literal/function/bind param
into a "foo AS bar" clause, better support in ansisql for this concept;
trying to get column list on a select() object to be Column and ColumnClause
objects equally, working on mappers that map to those select() objects