Add iterator_traits header file with tests

Standard library does not provide public type traits to determine
if given iterator satsfies requirements of specyfic iterator type.
This commit provide such a type traits with tests.

fix cmake's if condition

Fix cmake CGDB usage

Add 1.5 changelog

Klockwork fixes

Because no custom copy ctor/operator was provided copying ctree map
could result in double free.

previously only files passed to add_example were being checked.
This means that all .hpp files were omitted.

which were not added by add_cppstyle

Minor fixes

and reformat those tests

to silence klockwork

common: add missing @file annotations

common: unify include guards

common: create version.hpp file

and names of common files in examples

Find package refactoring

common: rm unnecessary field in libpmemobj++.pc.in

Because of:
"CPackRPM:Debug: *** error: %changelog entries must start with *"

common: simplify names of a few common functions

This just a small cleanup of function names that in retrospect
were badly choosen ;)
'pool::get_root' -> 'pool::root'
'pool::get_handle' -> 'pool::handle'
'transaction::get_last_tx_error' -> 'transaction::error'
'transaction::exec_tx' -> 'transaction::run'

common: move v class to experimental