The mmsystem.h header check didn't include windows.h so check fails even though mmsystem.h was present.

No biggie, but since this is C++, let's use the C++ includes.

Partial merge from pr/77

Setting the JACK_NO_AUDIO_RESERVATION environment variable let one skip
the audio reservation bits.

Indentation fix from smiszym

Correct date/version ordering in jackd.1

Doxygen fixes, less hardcoding and --htmldir

fix install with doxygen by generating doxyfile from doxyfile.in and letting waf do most of the process

rename the html_source_dir variable to html_build_dir (the directory contains built files, not sources)

Auto options and removed automagic dependencies

add the --sndfile auto option and check sndfile availability with env['SNDFILE'] instead of is_defined('HAVE_SNDFILE')

use pkg-config to find sndfile (drop explicit LIB_SNDFILE and HAVE_SNDFILE since check_cfg deals with it)

(the AutoOption class takes care of defining env['SAMPLERATE'] and HAVE_SAMPLERATE)

use conf.env['SAMPLERATE'] to determine wether samplerate is available instead of conf.is_defined('HAVE_SAMPLERATE')

move check for samplerate.h to before conf.sub_config('common') and remove the duplicate check in common

(drop conf.define('HAVE_CELT', ...) since the AutoOption class handles this)

make build option --winmme an auto option and use mmsystem.h and windows.h to check if winmme can be built