me: call self in recursive way but independent of mfilename

============
With argument,this funciton call the mfilename that it was located in, in an recursive way and can retrieve output.

function myFun (a,b)
...
me(1,2); % me is equal to myFun

end

===============
If no argument, this function returns a handle to mfilename.

function myFun (a,b)
...
aFun = me; % aFun is equal to myFun
aFun(1,2);

end

In this way, no matter how the function name is changed, there is no need to update recursive fucntion in the main contex.