Raptus.article.table

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* Fixed KeyError if no columns are defined for a table
* Added possibility to select the position where to add new rows

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* block modifications on a table definitions which are already in use.
* fixed odd/even rows
* add scrollbar to lightbox for large definitions.

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* Added info message to column configuration popup and fixed bug where multiple
save button appeared
* Added string normalization for column name to prevent exceptions when using non ascii
characters
* Replaced text field for defining the table style by a drop down fed by a property in
portal properties
* Improved descriptions of style and columns field in table content type to illustrate
the override mechanism if a table definition is selected

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* Fixed TableColumnsField (KeyError when saving columns)

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* Improved configlet and added table columns widget for table content type
* Added image and file types
* Added possibility to define cell and heading classes per column
* Added possibility to define a colspan for columns

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* Added French translations
* Updated German translations