blk: enable pool write-protection in debug mode
common: fix make clean of jemalloc

Headers generated by autotools was overwritten for both variants. After
make clean, these headers was not cleaned and therefore we had headers
from last configure run.
Merge pull request #4 from ldorau/blk-enable-pool-write-protection-in-debug-mode

blk: enable pool write-protection in debug mode
Merge pull request #3 from plebioda/fix-make-clean-jemalloc

common: fix make clean of jemalloc
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)