added csa_odf_example_gfa_sh.py to highlight the problem with the csa odf model sh coefficients and gfa computed from it
added csa_odf_example_gfa_sh.py to highlight the problem with the csa odf model sh coefficients and gfa computed from it

maurozucchelli/dipy,beni55/dipy,jyeatman/dipy,Messaoud-Boudjada/dipy,FrancoisRheaultUS/dipy,StongeEtienne/dipy,rfdougherty/dipy,samuelstjean/dipy,mdesco/dipy,mdesco/dipy,maurozucchelli/dipy,StongeEtienne/dipy,JohnGriffiths/dipy,beni55/dipy,samuelstjean/dipy,villalonreina/dipy,JohnGriffiths/dipy,sinkpoint/dipy,rfdougherty/dipy,nilgoyyou/dipy,nilgoyyou/dipy,maurozucchelli/dipy,matthieudumont/dipy,oesteban/dipy,demianw/dipy,demianw/dipy,matthieudumont/dipy,Messaoud-Boudjada/dipy,FrancoisRheaultUS/dipy,sinkpoint/dipy,jyeatman/dipy,samuelstjean/dipy,oesteban/dipy,villalonreina/dipy