obj: fix zone size calculations

The calculations for total available heap size for user
allocations didn't take all possible metadata into account,
leading to situations where for certain heap sizes
the zone size was too large by a chunk.

doc: update pmemobj_alloc.3

test: fix util_cpuid to require x86_64

with more precise description on using non-transactional API in transactions.

Signed-off-by: Lucas A. M. Magalhaes <lamm@linux.ibm.com>

test: catch threading failures as soon as possible

obj: fix defrag when the last object is referenced the most

Ref: #4505

test: vcxproj obj_defrag fixes

PTHREAD prefix doesn't make any sense, when its implementation
doesn't use pthreads on Windows.

Those variants handle failures.

test: remove logging from the parallelized path

Ref: #4505

Since our logging subsystem is not thread-safe
it should not be used by mulitple threads in parallel.

test: disable Valgrind in specified defrag test cases

These test cases last too long.

minor build system fixes

Will be used in generated realease packages, which contain prebuilt
man pages.

Fixes "make && make rpm/dpkg" on sources from release package.

Clobbering the tree makes sense because utils/copy-source.sh takes
whatever is in the source directory when it's not a git tree.

make .gz files reproducible

This makes the build reproducible.

doc: add dependency between compressed and uncompressed man pages

doc: stop generating txt files from man pages

fixes "make install" without "make" on freshly cloned tree

Markdown files are readable enough for quick look.

doc: add missing aliases

test: fix buffer overflow in obj_memops test

kill eatmydata in some tests

obj: remove fill ratio optimization from defrag

This patch removes a check from defrag that prevented
realloc of objects from highly filled runs to low filled runs.
This was originally done as a performance optimization to
reduce the number of realloced objects.

Turns out this has non-negligible negative impact on
effectivness of defrag.

Ref: #4369