Pyecore-py2

+++++

**Features**

- Add support for ``tag`` attributes in XMI.
- Add ``URI`` change support for ``Resource``.
- Add patch for ``issubclass`` so the test works regardless the input parameters
are ``EClass`` instances or not.
- Add ``xsi:schemaLocation`` deserialization support.

**Bugfixes**

- Fix bad containment feature value for ``contents`` on ``EAnnotation``.
- Fix resource resolving for non-trivial ``URI``.
- Fix bad crossreferences serialization for "many" features (collections).
- Fix issue for strings serialization in 'many' ``EAttribute``. Issue where
happening when whitespaces were in a String for 'many' ``EAttribute``.

+++++

**Bugfixes**

- Fixed ``many`` faulty computation in cases where ``upper == lower > 1``. This
case is not very common, but it could occurs.
- Fixed missing deserialization for ``EDate`` datatype. The missing method on
resulted in a bad ``str`` object conversion leading to an exception as the
a ``datetime`` object was expected instead of a ``str``.

**Miscellaneous**

- Improve ``many`` derived attribute computation, resulting in performance
improvements.
- Add performance improvement tweaks.
- Move ``dispatch`` from ``pyecore.dispatch`` to ``pyecore.utils``

+++++

**Features**

- Add ``dispatch`` decorator to mimic the ``doSwitch`` from EMF. This
implementation relies on the use of the ``singleDispatch`` decorator and does
not include a ``ComposedSwitch`` equivalent as some restrictions from EMF are
no longer an issue in Python.


**Bugfixes**

- Fixed ``lower`` and ``upper`` derived attributes computation. The previous
implementation were considering the attributes as normal ones instead of
derived ones.

- Fixed merge issue during ``0.8.0`` release. A case test was not properly
working, and models which have crossref towards models that were using
UUID raised an exception.

**Miscellaneous**

- Improved performances of the ``many`` derived attribute.

+++++

**Features**

- Add first support for ``EDerivedCollection``. The derived collections are
obtained from many features that are also marked as derived. A derived
collection does not stores nor gets direct information, instead it fetches
information from other collection, compute a result and store it. In the
realisation, a derived collection will inherits from a generic derived
collection that only proposed an empty implementation. Then, the
implementation must be manually added.

- Add multi-root support for XMI and JSON resources. XMI and JSON with multiple
roots can now be serialized and deserialized. Their handling is pretty
transparent as the addition of a new root goes through the ``append(...)``
method.

- Add a ``remove(...)`` method on resources. This method is pretty much the
opposite of the ``append(...)`` method on resources, it simply remove a
root from the resource.

**Bugfixes**

- Exception when a wrong type value was inserted in a reference for generated
code. The call to the ``EcoreUtils.isinstance`` method were raising an
exception as the last part of the code tries to deal with an unexisting
methods from the generated class.

- Fix ``EProxy`` 'force resolve' for static metamodels. When a proxy is set
towards a static metaclass, the proxy resolution tries to handle the
inverse reference list which only exists in the ``.eClass`` "level".
Consequently, when a static metaclass is used, the corresponding ``EClass``
instance must be used.

**Miscellaneous**

- Add new module for basic values and collections. This module contains the
``ECollection`` and ``EValue`` classes. These class were formerly in the
``ecore`` module, but due to further development, it is better to have it
into a dedicated place. This modification is retrocompatible and invisible
for existing manual/generated code.

+++++++++
**Features**

- Add xmi option for default value serialization. This new option allows to
save the default value in the produced XMI, and it also gives the ability to
store attribute set to `None` as `xsi:nill="true"` field.

++++++
**Features**

- Add href uuid (de)serialization for XMI. This new features allows the XMI
for having href that directly uses the uuid of the target element.


**Bugfixes**

- Fix nsmap computation for heteroneous models with crossrefs. When crossrefs
are serialized in XMI, they need to add the referenced namespace at the
root of the XMI. This fix adds these namespace and their related prefixes.