[xLinAlg] change resize API and behavior of xDenseMatrix class
After some discussion with other contributors the resize method of class xDenseMatrix have been changed so that it initialize its newly allocated memory with a defined value. By default this value is zero but it can be changed. Now use of resize guaranty a defined state for matrix term which avoid some issue like having nan in some location that cannot be cleaned out by use of *= operator with zero argument.
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