Original commit is a5f19f7dd6ae5bc93f73e0417a9e0bfd34c01672

1. someMatrix.data -> someMatrix.prt()
2. someMatrix.data + someMatrix.step * lineIndex -> someMatrix.ptr( lineIndex )
3. (SomeType*) someMatrix.data -> someMatrix.ptr<SomeType>()
4. someMatrix.data -> !someMatrix.empty() ( or !someMatrix.data -> someMatrix.empty() ) in logical expressions

Also fixed some typos and code alignment
Also adapted tutorial CPP samples
Fixed some identation problems

Made all STL usages explicit to be able automatically find all usages of
particular class or function.