Add test to exercise simple append.

Add a test which exercises a simple append operation and ensures the
operation succeeds.
Fix specification and documentation.
Fix formatting.
Remove lager console code.
Adjust whitespace and commenting.
Adjust commenting.
Adjust formatting.
Adjust formatting.
Update log file name.

Name the log files differently so it's easier to debug -- start the
log file with the partition which has opened and locked it; follow that
with the preference list the virtual node / log file belongs to.  There
should be ?N log files per virtual node; one for each participating
"ensemble."
Deprecate get_partition.

Remove the get_partition function which adds one to the partition
identifier; it's unclear what this code was used for; it was only used
in the naming of the log files and would not coorelate easily to any of
the running virtual nodes.