Constant2

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**Features and Improvements**

**Minor Improvements**

**Bugfixes**

**Miscellaneous**

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**Features and Improvements**

- add ``Constant2.BackAssign`` method, define entity mapping in a more clean way.
- add ``Constant2.ToIds``, ``Constant2.to_ids``, ``Constant2.ToIds``, ``Constant2.ToIds``, ``Constant2.ToClasses``, ``Constant2.to_instances``, ``Constant2.SubIds``, ``Constant2.sub_ids``.

**Minor Improvements**

- from 98% to 99% test converage.

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- do nothing.

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- do nothing.

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**Minor Improvements**

- upgrade inclueded ``superjson`` from 0.0.8 to 0.0.10
- upgrade inclueded ``inspect_mate`` from 0.0.1 to 0.0.2

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**Features and Improvements**

- Allow inheritance.
- Require all nested class is inherit from Constant.

**Minor Improvements**

**Bugfixes**

**Miscellaneous**

- Remove code from packages that never used.