[eigen] unit-tests

[Benoît Jacob <jacob@xxxxxxxxxxxxxxx>]

Hi List,

We now have some real unit-tests (more to come). They already allowed to 
discover (and fix) several grave bugs. Some were compilation bugs. Another 
one, introduced by me when I modified Michael's loop unroller, caused the 
first entry of matrices to be copied twice. It then causes errors in e.g. 
operator +=. This is now fixed, and the removal of the redundant copy also 
improves performance.

The performance chart is now:
Eigen1: 8.2s
Tvmet:  6.1s
Eigen2: 5.0s

If someone wants to help, a simple TODO item consists in letting the test app 
take a command-line argument --seed=value, which would allow to easily 
reproduce test failures. I think that Qt can help parsing the command-line.

Cheers,
Benoit

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