vmem: implementation of vmem_freespace()
Merge pull request #8 from spawlows/implement-vmem_freespace

vmem: implementation of vmem_freespace()
pmem: implementation of pmem_map()
Merge pull request #10 from krzycz/pmem_map-impl

pmem: implementation of pmem_map()
doc: minor tweak to man page language
pmem: add support for clflushopt

- Implement pmem_fence()
- Choose clflushopt over clflush when supported by the CPU
- cstyle and uniformity changes (tacked on by @andyrudoff)
- Add pmem clflush /proc parsing unit test (tacked on by @andyrudoff)