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spetialization of linearSystemPETSc to avoid code duplication

can control its behaviour on empty matrices

petsc : zeroMatrix() : do not call MatAssembly on empty matrix, it destroys preallocation on petsc 3.4

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destructor of the block solver

Fopen deals with non-ASCII filename paths on Windows.

bindings (a better solution would be welcome)

a frame solver is made
changed INRIA MESH output
removed feaure in BL field
started to do MNT diagrams
 

before MatXXXSetPreallocation)

new options to enable image output at arbitrary sizes (cannot simply resize the main window, as some OSes forbid resizing the main window larger than the screen)