Merge pull request #1168 from van51/develop

NNZ: added unit test and fixed get_next_feature()
Fixed recomputing of posterior parameters
Merge pull request #1170 from votjakovr/develop

Fixed recomputing of posterior parameters
minor fix for eigen3 check in SGObject_unittest
enable location info (as in object / function name printing before SGIO
prints) with config option to disable / show line and file
add pretty function macro in defines
Merge pull request #1171 from lambday/develop

minor fix for eigen3 check in SGObject_unittest
class CLinearOperator and DenseMatrixOperator added
Merge pull request #1173 from lambday/feature/log_determinant

class CLinearOperator and DenseMatrixOperator added
Basic classes