nodes.h : Cycles node class and variables here 
blender_shader.cpp : additional props here --- non socket stuff (No warnings)
drawnode.c : non socket rna stuff
node_shader_tex_..... : definitions and sockets and GPU....sockets and glsl function should be in same order
rna_nodetree.c : rna stuff and use rna_ShaderNode_socket_update for socket updates
DNA_node_types.h : DNA for enums etc
nodes.cpp : cycles socket definitions and OSL params 
	--- non socket stuff for OSL e.g compiler.parameter(this, "foobar");  (No warnings)
svm_types.h : cycles enums
nodeitems_builtins.py : UI menu
svm.h : node function
nod____.osl : variable names are case sensitive