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Features:
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* Implement ``\sf+`` function_name. (Thanks: `Lele Gaifax`_).
* Separate check constraints with newlines. (Thanks: `Joakim Koljonen`_).
* Enabled ``\dm`` command, corrections to ``\d+``, extended tests. (Thanks: `rsc`_).
* Opening an external editor will edit default text. (Thanks: `Thomas Roten`_).