Most of the format-strings for uint64_t were wrong. %llu is architecture
dependant whereas uint64_t is always 64bit long. The PRIu64 macro (from
inttypes.h) provides the correct formatstring.
Change the FFSB behaviour if the reuse-flag of the filesystem is "1" but the
filesystem can not be reused: Previously FFSB created a new filesystem, now FFSB
fails with an error message.
By outputting the individual response times for each request a better analysis
of the results is possible. It should be kept in mind that this accounting uses
some main memory for the storage.
FFSB wrongly accounted writefile operations. The whole filesize was taken into
account and not only the amount written to the file. This lead to extremly high
throughputs.