Default to --temp mode when not using --git in config-merge. #1410
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When running config-merge in rsync mode, it is often the case that the default 'config' directories are not writable by the web server. In this case, --temp must be used, or config-merge will fail.
In the instances where the 'config' directories are writable, there is never a need to export the configuration to these locations; --temp is always a workable option when in rsync mode. --temp is already ignored when using --git.
This patch makes --temp the default for rsync mode, as this is a more sensible default.