Hi Martin,
 
I've work again on the builder package a little bit. I've  added the weight 
matrix to calculation as we were talking about few month ago. I'm ready to  do 
the commit, but I'm having just one little problem. The weights are calculated 
from the accuracy of each MappedPosition and it means that we need to treat the 
case when not all of the point has the accuracy setup (it is Double.NaN by 
default). 

Can I ask you on your opinion about what exception and where should be thrown? 
On other hand in no residual transformation (RubberSheeting) its doesn't matter 
whether we know accuracy or not. The wights are included just in 
ProjectiveTransformBuilder and its children.

My proposal is to add the some method like includeWights(boolean weights) into 
the ProjectiveTransformBuilder so user can switch whether to calculate with 
weights or not and the exception should be throwen here when accuracy is not 
defined.

 
Thanks for help.

Cheers, 
Jan.


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