New packages libbiosig, stimfit, started with python package

Packages of "libbiosig" (including biosig-tools) and stimfit have been added. 

Furthermor, I've started to work on cross-compiling python. It's not done yet, but it looks like only three more python modules need to be patches. 

BTW, I've merged the changes from your multi-target branch into my branch, and might have upgraded some packages on the way.


Alois