[eigen] Indexes: why signed instead of unsigned?

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First of all, thanks for putting this library together.  It certainly took 
(and still takes) quite a lot of time and energy to build it and the end 
result is a extremely useful library which is both simple to use and also 
extremely efficient.  Certainly I'm not alone when I say thanks for putting this 
code together.

Having said that, while I browsed through the code I've noticed that Eigen has 
been written using signed integers for it's indexes.  Is there any reason 
behind this design choice?

Thanks for the help,
Rui Maciel

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