Indexia

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**Features:**

* Add 'zettelkasten' template to ``indexia.eidola.Templates``.

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**Features:**

* ``eidola.Templates`` class to create sample data.

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**Features:**

* ``indexia`` module to create & manage hierarchical data structures.
* ``inquiry`` module to support dynamic SQL generation.
* ``schemata`` module to create XML, dataframe, & network graph representations of indexia data.
* ``eidola`` module to create sample indexia data.