CPPLapack Code

contrib/dge2vtk was added.

*The default file format of write and read function was changed.
The write functions append a '#' at the very begining of the file.
For the backward compatibility, read functions can read files without the '#'.

*The style of "[ERROR]" messages was slightly changed.

Cast functions from normal classes to small classes were midified.
The to_XXXmatrix_small() type functions were removed.
Use explicit constructors of small classes instead.

operator* and operator*= functions between a pair of Xgbmatrix were fixed.

contrib/SOR was added.

*contrib/GMRES was added.

*update contrib/Subspace

2D vector and matrix classes were added.

*add a few missing functions.
*update contribution functions for subspace iteration.

add the simplest Subspace contribution function