[Carpet] Change to vect<> class

[Erik Schnetter]

I plan to push a change to the vect<> class shortly.  This should  
clean up the API that it provides.  If you use the vect class in your  
code, then you may need to add some explicit type conversions from  
vect<int> to vect<CCTK_REAL> to your code.

Previously, the arithmetic operations (+-*/) were declared as member  
functions.  This allowed operations like vect<int> + int, but not int  
+ vect<int>.  I have converted these functions to non-member  
functions, which allows both operations.  However, at the same time,  
implicit type conversions from vect<int> to vect<CCTK_REAL> and vice  
versa will not happen any more.

I consider both changes an advantage.  Implicit type conversions are  
often problematic, because they can happen unintended.  However,  
being able to say "2 * x" where x is a vector is a natural notation.

I hope that this will not break too much of your code.  Please tell  
me if you need help correcting syntax errors in your code.

-erik

-- 
Erik Schnetter <schnetter at cct.lsu.edu>

My email is as private as my paper mail.  I therefore support encrypting
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