pmem2: add asynchronous memmove and memset

doc/Makefile

doc/libpmem2/.gitignore

src/include/libpmem2.h

src/libpmem2/libpmem2.def

src/libpmem2/libpmem2.link.in

src/libpmem2/mover.c

src/test/pmem2_mover/TESTS.py

src/test/pmem2_mover/pmem2_mover.c

src/test/scope/out13.log.match

src/test/scope/out14.log.match