sync code with internal version

	- fix compilation on Mac OS X
	- add doc directory and split README
	- add 'normalize' to Makefile target
	- add automatic mode to 'twixtool'
	- make 'poisson' tool use dims 1 and 2
	- add option to 'rsense' to scale output
	- parallelization for 'cc' and 'homodyne'
	- rename octave viewer 'view.m' to 'octview.m'
	- use periodic boundary condition in Walsh's method
	- change default tolaerance for CG to 1.E-3
	- add 'md_next' and 'md_circ_ext2' functions
	- fix divide-by-zero for CG without regularization
	- other minor changes and enhancements

Makefile

@@ -95,7 +95,7 @@ ismrm.top := /usr/local/ismrmrd/
 # Main build targets
 
 TBASE=slice crop resize join transpose zeros ones flip circshift extract repmat bitmask
-TFLP=scale conj fmac saxpy sdot spow cpyphs creal
+TFLP=scale conj fmac saxpy sdot spow cpyphs creal normalize
 TNUM=fft fftmod noise bench threshold conv
 TRECO=sense pocsense rsense bpsense itsense nlinv nufft rof nusense
 TCALIB=ecalib caldir walsh cc
@@ -123,7 +123,7 @@ MODULES_walsh = -lcalib
 MODULES_cc = -lcalib
 MODULES_nufft = -lnoncart -liter -llinops
 MODULES_rof = -liter -llinops
-MODULES_bench = -lwavelet2 -llinops
+MODULES_bench = -lwavelet2 -lwavelet3 -llinops
 MODULES_phantom = -lsimu