Create datastore directory and all parent dirs if it does not exist
More robust error checking and buffer overflow protection
New mkdirs() and mkdirsn() functions
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.
- argv is (const char *const *) everywhere, to avoid having to strdup() all the
Java arg strings
- changed (char*) to (const char*) in lots of places to fix cascading compiler
warnings as a result of argv constness
- fixed a bug in "config get" command when used without 'variable' arg
- new test cases to cover new payload with different versions
- exit status of 2 when duplicate is detected
- tighten up other test cases
- fix bug in sqlite_exec_int64()
- adding a bundle using an existing manifest with an incorrect payload should
fail with an error
- adding a bundle using an existing manifest to update the payload to a new
version should succeed
- improve format of "dna rhizome list" output to one bundle per line
- 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
