a first attempt to unify sequent_send from dsa  and cb_synchronizer.js

A attempt to create complex solution for complicated combination of async calling:
-function with callbacks for delayed calling to return results of long operations
-function for pre and post processing of returned results
-dsa service message passing with message receiving

To work with all from above together sequent concept is created.
sequent renamed into sequence.

Concept is done. Sequence now resolv sequential doing every thing from:
-sending messages to dsa services
-receivind resulting message from dsa services
-function which require callback for operations which take a while
-function for pre- and post-processing in any place of sequence
-dinamic adding in sequence new thing to do