ITS#5465

ITS#5401, #5405, #5407, #5413, #5418, #5426, #5430, #5432, #5433, #5434

use the replication persistent search identity to check whether a modification must be replicated (ITS#5418)

first round of s/sprintf/snprintf/; the rationale is: truncate error messages rather than buffer overflow; otherwise, assert that no buffer overflow occurred.  In some cases, error handling could be added.

ITS#5211 spec says we must ignore invalid cookies