The goal of this patch is to encapsulate classes derived from MyMoneyObject. It follows KDE's Library Code Policy.
It considers all classes derived from MyMoneyObject.

Changes:

1. d-pointers to move includes for non-PODs to source files, for now they are only for data members,
2. all accessors in source file and handled through d-pointer, to keep all data members in one place i.e. in PIMPL,
3. more forward-declarations.

Changes pattern is the same for all classes. Little code changes e.g. some loops use foreach instead of iterators. It avoids crashes.

All tests pass and I couldn't trigger crash during navigation through application.