(JEC/MR) 15/4/15 update laguerre_numbers.h to set automatically the flaoting...

(JEC/MR) 15/4/15 update laguerre_numbers.h to set automatically the flaoting size; use OpenBLAS in laguerreTransform.cc to compute the Analysis/Synthesis

README.md

@@ -25,7 +25,11 @@ Look at the `libsharp-code/libsharp/sharp_cxx.h` file and add if necessary
 
 	sharp_geom_info* get_geom_info() { return ginfo;} 
 	sharp_alm_info*  get_alm_info()  { return ainfo; }
+* OpenBLAS: 
 
+If the variable `CBLAS` is defined then the code of laguerreTransform.cc use the BLAS matrix multiplication highly optimized. See installation in the Readme.md using
+`git clone https://github.com/xianyi/OpenBLAS.git`	
+**WARNING** on Darwin the `cmath.h` is replaced by `cmath_openblas.h`
 
 # Compilation
  	> edit Makefile and adapat to local platform :