#1 refactor collection structure interface

[Anonymous]

the collection description structure should be unified
among various data structures (utility structures,
collections, dictionaries) and a "bad cast" function
should be implemented in each of them;

thus it will be possible to replace clc_* macros with
regular functions that will eliminate some ugly side
effects (main problem - inability to use currectly
clc_size(i++) as i is incremented twice in the call)

the "bad cast" function will do nothing but set up
collection error status to "bad cast"

this way, all structure descriptions should look like that:

struct ..._desc {
(... general object functions ...)

(... collection functions ...)

(... dictionary functions ...)
};

This is not a performance or memory problem as
description object is shared among all collection instances