- since mediafire cannot deal with empty files, we put new files into a
temporary location and upload them once they get closed
- add create and write functions to fuse
- pass a file handle to mfconn_api_upload_simple instead of a path
- allow calc_sha256 to also compute the file size
- error out when the key returned by upload/simple is empty
- make valgrind.supp more lenient
- don't use folder/get_content but rely on parent information
- add many more debugging information and sanity checks
- ignore trash
- correctly update local device revision using device_response
- remove "visited" member and change housekeeping function to check for
consistency of parents and children (and retrieve fix from remote if
necessary)
- print key and parent key in the debugging function
- check for remote updates on every fs function
- introduce global defines for key and filename length
- add parent member, getters and setters to file.h
