[common.exceptions] added more exceptions
[la.container] added static_type()
[la.container] let dim return unsigned int
[la.container] added stl compatible constructor
[test.la_container] added test for static_type()
[parameters.base] added Parametric
[operators.interfaces] added OperatorInterface
[operators.eigen] added EigenDense and EigenRowMajorSparse
[test.operators] added