Collective-datagridcolumns

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- Python code now support the new ``required`` method that has been added
in version 1.9.0. Old DGF versions are still supported [keul]
- Python code now support the new ``col_description`` method that has been added
in version 1.9.0. Old DGF versions are still supported [keul]
- Removed any reference to ``label_msgid``, unused by DataGridField also
(see `9`__) [keul]

__ https://github.com/collective/Products.DataGridField/issues/9

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- Added new column: DateColumn, that allows to add date values [cekk]
- Catch ``ParseError`` exceptions [keul]

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- Fixed a bug introduced with version 0.3. See `1`__ [keul]

__ https://github.com/RedTurtle/collective.datagridcolumns/issues/1

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* Fixed manifest and readme [cekk]

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* ReferenceColumn - added base Column default paremeters: ``default_method``, ``label_msgid``, ``required`` [cekk]

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* ReferenceColumn - added an alternative jQuery library, installable using a separate
Generic Setup profile [keul]
* ReferenceColumn - fulltext search is now restricted to the path of the calling context [keul]
* ReferenceColumn - URL where to perform AJAX call is taken from a ``ICallingContextProvider``
adapter. 3rd party products can provide a more specific one than the default (that still
call the portal url) [keul]