initial attempt at a multi-threaded Scenery::rayTrace
provide an actual API for Scnery::nthreads_
rework yorick/gyoto_Scenery to render gyoto_Scenery_rayTace usable, it is the only way use nthreads from within yorick
+ bugfix: initialize xnthreads in bin/gyoto.C
+ add gyoto_verbose() in yorick/gyoto_utils.C
+ improve informative output in Scnery::rayTrace()
implement explicit KerrBL copy constructor
SceneryThreadWorker returns NULL
* use gettimeofday() for profiling
* clone Photon in _each_ thread, including the parent (when nthreads_ > 1)
* include mk-movie*.i
document mk-movie-fork-raytracing.i
add github URLs in  mk-movie-fork-raytracing.i
fixup (s/CFITSIO_PATH/CFITSIO_LDFLAGS/ local_settings)
bin: clean bin/Makefile, rm gyoto.o in make clean, add includes for getpid() in gyoto.C
Merge branch 'master' into pthreads

Conflicts:
	bin/Makefile
	yorick/Makefile
Merge branch 'master' into pthreads
yorick: put -L../lib and -I../include in front of COPTS
Merge branch 'master' into pthreads
Disk3D_BB.C: updated computation of Sem, Vem
In Disk3D_BB.C: computation of Sem, Vem updated
yorick: put -L../lib and -I../include in front of COPTS
Add Spectrum::Generic::~Generic() virtual destructor
* fix buffer overflow in lib/Factory.C
* update paper ref in bin/gyoto.C
* take environment (CXX|CPP|LD)FLAGS into account in local_settings
* harden CXXFLAGS by default, may not work for all arches
Merge branch 'master' into pthreads

Conflicts:
	local_settings
Mention prepackaged binaries in INSTALL