Tkfilebrowser

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* Add tooltips to display the full path of the shortcut if the mouse stays long enough over it.
* Fix bug: style of browser treeview applied to parent

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* Fix bug: key browsing did not work with capital letters
* Add specific icons for symlinks
* Add handling of symlinks, the real path is returned instead of the link path

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* Fix bug concerning the initialfile argument
* Add column sorting (by name, size, modification date)

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* Set default filebrowser parent to None as for the usual filedialogs and messageboxes.

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* Initial version