[2012-07-02] Filter options lack some real-world use cases

[silverstripe-issues]

created by: @smagnusson (smagnusson) created at: 2012-07-02 original ticket: http://open.silverstripe.org/ticket/7605

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Page filter lacks some real-world options people need, and there's a minor issue with an existing field;

1. Date field doesn't have a popup calendar nor any sort of date validation it seems.
2. Add new column "Pages underneath" -> and show a Site Tree. This filters to pages only within a certain area of the tree. Important when using with Listview.
3. "Edited by" (Drop down/auto complete? of authors). Reveals a list of pages edited by someone (preferably looks up version table), top option should be "Me (Sigurd Magnusson") to make finding yourself easy.