Advanced Scroll Subplot Function

Further development of scrollsubplot(), scrollplotdemo() and scrollplot().

In this version a figure handling and autoplot function is implemented.

The new subplot handling inspired by Benoit Cantin allows to plot several signals of the same length and scroll them simultaniously.

The usage is now also more simplyfied:
Example 3:
x=0:1e-2:2*pi;
y=sin(4*x);
[fh ah] = scrollsubplot704(3,x,[y' y' y'],[],'on');

For more information, please read the comments inside the file.