Dtool

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Added
^^^^^

- ``dtool cp`` to replace ``dtool copy``
- ``dtool readme write`` to write readme from file or stdin


Deprecated
^^^^^^^^^^

- ``dtool copy`` in favour of ``dtool cp``


Removed
^^^^^^^

- Removed ``created_at`` field from default README template


Fixed
^^^^^

- Defect in ``dtool create`` when providing a relative path to the
``--symlink-path`` option
- Python 2 defect in dealing with unicode in README.yml file when using
``dtool readme edit``

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Fixed
^^^^^

- Deal with issue in how ruamel.yaml deals with float values

---------------------

Added
^^^^^

- Added ability to update the name of a frozen dataset

---------------------

Added
^^^^^

- Validation of dataset name upon creation
- Validation of dataset name when updating it

---------------------

Added
^^^^^

- Ability to update descriptive metadata in README of frozen datasets
- Validation that the descriptive metadata provided by the
``dtool readme edit`` command is valid YAML

---------------------

Added
^^^^^

- Pre-checks to 'dtool freeze' command to ensure that there is no rogue content
in the base of disk datasets