Release v1.51.2

This release fix the problem related to the communication using the Communication Manager project.
This problem was related to the time of 100 ms set for the manager used in S4CCS to execute one iteration of its internal loop, together with the timeout of 200 ms set for the manager used in S4GUI. There were some situations where S4CCS needed two iterations (200 ms) to answer a request. This answer, in turn, was interpreted as a timout event by S4GUI.