The sequence start time was only getting set in overlay_interface_init(), which
was not always called, or was called after overlay_gettime_ms() had already
been used.
Added FATALF(), FATAL() and FATAL_perror() macros.
Removed a bunch of debug statements no longer needed in monitor.c and server.c.
- If a bundle has the same payload hash and manifest.name as one already in
the rhizome store, then the "dna rhizome add" command will not add it
- Now passes fourth test case in tests/dna_rhizome
Now successfully fetches manifests for files we already have in
the database, using the existing database copy of the file.
Also added filter to stop same file being fetched more than once at
same time..
