refactored sizeof_ptype, sizeof_stype to make them available from static context
first parts of copy_ptype with unit tests
-refactored compare_stype a bit
-added copy_stype method with first bits
-added first unit test for copy_stype
Remove redundant clone, drop MT composite machine
initial (working) attempt for a general purpose clone method of CSGObject. Comes with first basic unit tests. More to come
Merge pull request #1167 from karlnapf/develop

first attempt for general clone method
convert CSparseFeatures to use SGSparseMatrix
require new data version
NNZ: added unit test and fixed get_next_feature()
Merge pull request #1168 from van51/develop

NNZ: added unit test and fixed get_next_feature()