This is a bugfix release. * Don't complain and quit if `persistence_file` option is given (bug #802423). * Initialise listeners correctly when clients with duplicate client ids connect. Bug #801678. * Memory tracking is now disabled for Symbian builds due to lack of malloc.h. * Fix memory tracking compilation for kFreeBSD. * Python callbacks can now be used with class member functions. * Fix persistent database writing of client message chunks which caused errors when restoring (bug #798164) Thanks to Neil Bothwick, Yuvraaj Kelkar, Craig Hollabaugh, Karl Palsson and Andy Piper.