[eigen] it compiles, so ship it!

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Hey List,

I've been doing cleanup in tvmet, the sloccount has already gone down from 
12215 to 9861 in the include/tvmet/ directory alone.

The cmake porting it pretty much done too, which is another big 
simplification. I haven't yet removed the old m4/ac/in files and the old 
per-platform headers, so expect another big cleanup soon.

I thought it'd be an appropriate time to celebrate as I've been able to 
compile without warning and run a simple test program (below). That's a big 
relief for me as removing thousands of lines of code of a project you don't 
know the code of is scary (and funny at the same time).

What's been removed? Many operation on matrices/vectors that generated too 
much code given their low usefulness. That includes mostly per-element math 
functions and per-element comparison/boolean/binary operations.

Can't run the testsuite as I first need to get rid of the cppunit dependency, 
I think I should port that to QTestLib.


PS. My test program, taken from tvmet tutorial:

#include <tvmet/Matrix.h>
#include <tvmet/Vector.h>
#include <iostream>

using namespace tvmet;
using namespace std;

int main(int argc, char *argv[])
  Matrix<double, 3, 2> m1; // yes, non-square matrices are possible as well
  m1 = 1, 4,
       2, 5,
       3, 6;
  cout << m1 << endl;
  return 0;

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