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Fixed a bug in single backup where the --mirror parameter was ignored.

When the server has a delimiter that is different from the default /, the user can now specify the value.

When the server uses a namespace (that was not present at the moment of backup), it is now possible to specify it.

Suppressed mailbox and metadata '...is invalid' messages when these files are missing. Now, the messages are printed when a file is actually malformed.

Previously, mailboxes and metadata files would get deleted after migration.

This release serves only to update the documentation at rubydoc.info

Bugfix: check for the presence of the spec directory before conditionally activating code coverage

Documentation is now split into two areas:

• End-user facing: via the README on GitHub
• Developer: via a different main YARD page on rubydoc.info

Identical in terms of code to 14.4.0

• Always check whether the configuration file has folders listed as an Array of Hashes, and convert to the newer, simpler, structure. See #184