Sortedcontainers

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**Bugfixes**

* Changed ``SortedList.__setitem__`` with slices to correctly update internal
"maxes" index.

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**API Changes**

* Added ``__ior__``, ``__iand__``, ``__isub__``, and ``__ixor__`` methods to
``SortedSet`` interface.

**Improvements**

* Changed position-based indexing to use dense tree-based index.

**Miscellaneous**

* Added workload-based performance comparison for sorted list: Priority Queue,
Multiset, etc.

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**Bugfixes**

* Changed copy methods to make shallow copies: values are not copied, only
references to values are copied.

**Miscellaneous**

* Added load-factor performance comparison documentation.

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**API Changes**

* Added ``value_orderable`` parameter to ``SortedListWithKey`` to support
incomparable value types.

**Bugfixes**

* Changed ``repr`` methods to prevent infinite recursion and allow easier
subclassing.

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**Miscellaneous**

* Added more testing for sorted lists with key-callable argument.

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**API Changes**

* Added ``SortedListWithKey`` type with implementation based on
``(key, value)`` tuples.