Add function to check if a property is of type PT_BINARY or PT_MV_BINARY
Lower case the mapistore rowcount header variable
Change mail to mails to respect REST collection naming conventions
Handle unicode strings returned by json layer
Decode base64 encoded binary blobs
Add sample appointment
Fix typo/incorrect check leading to crash in talloc_strdup
[mapistore-python][sample-backend]: enable get and set properties for attachments
[mapistore-python][sample-backend]: fix set_properties and save (changes in folders and messages didn't have any effect)
[mapistore-python][sample-backend]: implement delete_message (hard deletion)
[pymapistore]: Changes in get_properties behaviour

* If there are no arguments, returns all the properties
* If the argument is a list of properties, return these properties
* If the argument is an empty list, return an empty dictionary
[mapistore-python][sample-backend]: fix attachment ID behaviour, use attachment cache and add set_properties
[mapistore-python][sample.py]: include "next_aid" in message entries
[mapistore-python][sample-backend]: implement create_attachment
[mapistore-python][sample.py]: fix white spaces and line breaks
[pymapistore]: include attachment ID in Python bindings
[python-backend][sample.py]: add destructor so objects in the cache are cleaned
[mapistore-python]: implement ROPSaveChangesAttachment