Improve behavior if PersistenceTypeDictionary.ptd is missing

[hg-ms]

Trying to load an existing storage with a missing PersistenceTypeDictionary.ptd causes an unclear exception.
Maybe the exception could be improved or the storage initialization could handle the case that storage files already exists but the PersistenceTypeDictionary is missing.

[hg-ms]

The TypeHandlerManager gets initialized before the storage can check for missing files.
In case of no type-dictionary file the TypeHandlerManager creates a new default type dictionary.
It is not possible to distinguish between a new storage starting the first time or starting an existing storage with a missing type-dictionary file.
As improvement an info log message could give a hint that the TypeHandlerManager uses a newly created type-dictionary at startup.

[hg-ms]

fixed by eclipse-serializer: eclipse-serializer/serializer#77