svs on multiple threads
made svs stuff actually work
more things on more threads
removed thread 0 special-case
cleanup
fixed destruction of serializers
multistore_ptr_t no longer constructed on serializer thread
Revert "multistore_ptr_t no longer constructed on serializer thread"

This reverts commit 0ce45ef2bb1b5138a381e6dccdbee2ee01e2b3e5.
multistore_ptr_t now constructed on serializer thread again
removed stores->out() from pmap
Merge branch '1446_stores_on_all_threads' into next