Improe Doxygen documentation

modified:   ../CMakeLists.txt
modified:   ../Doxyfile.in
modified:   ../zfsd/configuration/zfs_config/zfs_config.h
deleted:    ../zfsd/control/cli/src/Makefile
new file:   ../zfsd/dox/buildsystem.h
new file:   ../zfsd/dox/coding.h
renamed:    ../zfsd/include/mainpage.h -> ../zfsd/dox/mainpage.h
modified:   ../zfsd/lib/threading/barrier.c
modified:   ../zfsd/lib/threading/barrier.h
modified:   ../zfsd/lib/threading/pthread-wrapper.h
Merge branch 'cli' of github.com:snua12/zlomekfs into cli