Nsot

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* Improved indexing on common attribute-value lookups.
* All attribute-value lookups are index now by the most commonly used
search patterns (name, value, resource_name) and (resource_name,
resource_id)
* Moved Interface.get_networks() and Interface.get_addresses() to used
concrete JSON cache fields on the objects. This is a huge query-time
optimization.
* Tweaked admin panel fields a little bit to remove references to now
defunct 'Resource' objects.

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* Overhauled the relationship between Values and Resources.
* Drastic performance improvement and more accurate indexing of
attribute Values in databases with millions of rows.
* Got rid of multi-table inheritance from base Resource model that was
used to allow a generic foreign key from attribute Values to Resources
(Devices, Networks, Interfaces are all resources)
* All Resource subclasses are *abstract* now. Which means the model
fields they inherit are concrete on their own table.
* The Value object does not have an FK, and instead has a composite
primary key to (resource_name, resource_id) … for example ('Device',
16999) which is indexed together.
* The Attribute name is now also stored in a concrete field on the
Value at creation, eliminating a lookup to the Attribute table.
* All of these changes are accounted for in the database migrations, but
need to be done carefully! It's going to be quicker and easier for
databases that don't have Interfaces.

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* Bug and performance fixes for Interface objects.
* Fix poor performance when there are lots of Interface objects.
* Bugfix to missing interface type 53 (proprietary virtual/internal)
* Added ``smart_selects==1.1.1`` so that FK lookups on Interface.parent
will be limited to owning Device.
* Temporarily convert Interface.parent_id to raw ID field, until an
autocomplete feature can be added to the browsable API.
* Updated unit tests to validated CRUD for Interface.parent_id.

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* Fix a 500 crash when database ``IntegrityError`` happens.

+ This will now be treated as a ``409 CONFLICT``.

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Schema change to fix confusion when selecting parent objects.

* Benchmarks for Network and Interface objects are a *little* faster now
too, direct table access for parent.
* Device objects no longer have an extraneous parent attribute.

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* Enhanced and clarified sections in README.rst
* Converted README from .md to .rst
* Clarified virtualenvwrapper instructions (fix 90)
* Made use of git clone more explicit (fix 91)
* Updated required version of Django REST Framework to v3.2.4