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Conflicts:
	commandline.c
	tests/rhizomeprotocol

Because Android <stdio.h> defines 'stderr' as a macro...

Add STRUCT_ASSIGN macro to config schema

Document STRUCT_DEFAULT and STRUCT_ASSIGN in block comments

Move 'log.file_xxx' options to 'log.file.xxx'

Improve some comments in strbuf.h

Not used for anything

Refactor log.c ready for log file rotation

Add test case for "rhizome push <url>" command

Refactor much of the new code in log.c

Add new functions: cf_load_strict() and cf_reload_strict() for use by the
server, which does not want to overwrite its in-memory config at all if there
is any defect in the config file.  However, commands always want to overwrite
the default in-memory config, even with a defective config file, so that
logging has a chance to succeed.

Added `log_format.dump_config` boolean config option

Indepent configuration of show_pid, show_time and log level for each
destination

Update test scripts for new config options

Include xprintf.c in MDP client source files (now used by log.c)

Upgrade configuration schema macros to allow optional "default label"
argument to SUB_STRUCT and VALUE_SUB_STRUCT elements.

New STRUCT_DEFAULT section declares alternative STRUCT default values
with a label.

Re-order the documentation sections and add more explanation
of how an invalid config file is handled.

Because log.c and conf.c now depend on serverMode

Rename duplicate AddNoAuthor test to AddNoAuthorEncrypted

Fix broken AddNoAuthor test

Add new AddInvalidAuthor test

Also quieten start-up log messages for invoked commands, to reduce chatter

Also fixed non-portable (endian dependent) code

Sometimes, when adding a PIN to a keyring (eg, when opening a keyring
file), a SEGV would be caused while trying to validate the MAC for an
entry which apparently had zero keypair entries.

Changed some keyring struct 'int' fields to 'unsigned int', to ensure
that comparison logic behaves as expected.

Refactored some keyring code for more clarity and code maintenance
safety.

Added TODO comment about keyring file format non-back-compatibility.