Replace ".selfsigned" column with ".author" and ".fromhere" columns in
output of "rhizome list" command. (Note that a "sender" column is
already present.)
Add 'author' field to struct rhizome_manifest.
Log all fully rendered SQL statements on DEBUG_RHIZOME.
Update 'rhizomeops' test cases and improve the assert_rhizome_list()
test function to be able to assert authorship of files.
Cherry picked from commit e994626429, conflicts
in testdefs.sh resolved manually (start_servald_instances() sets DUMMYx
variable).
Move create_rhizome_identities() from testdefs_rhizome.sh to
create_identities() in testdefs.sh
Rename create_identity() in testdefs.sh to create_single_identity(), uses
create_identities() to do its work.
