[igraph] new version

[robin cowan]

Dear list,

I am happy to see that the new version has been released. I am sure  
there are lots of new useful things in it.
It does pose a bit of a problem though for those of use with lots of  
scripts written using the old library. I refer to the change in  
indexing.
So a simple question: How can one keep both libraries available, with  
different names I suppose (igraph5 and igraph6 eg), so old scripts  
could run by loading igraph5 etc.

Thanks,

Robin Cowan