[errors][communication] Keeps going with the error implementation.
[error][communication][Xbee] Enhances slightly the use of Xbee_api, makes Xbee4bn compliant with global_errors.h.
[communication][error] Makes botnet/shared compliant with global_errors.h.
[communication][error] makes botNet compliant with global_errors.h (except for functions located outside botNet.