Slc.linkcollection

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- Added new styles to linkbox, provided by cornae. Reference: Syslab 1152
[cornae, thomasw]
- Added anchor and corresponding "Go up" link. Reference: Syslab 1152
[thomasw]

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- deactivated setting the div's height to maxheight 253 [thomasw]

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- set a class denoting the currently selected item also on the <li>, not only
on the <a> tag [thomasw]

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- Nothing changed yet.

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- Bug fix: the parent folder could be selected as a link even though it isn't a
document
- Feature: scroll to the top of the linkbox when a document is displayed
without causing the page to jump up and down for longer and shorter
documents.

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- linkcollection can now also be used on ATFolders. For the Annotations-factory, I had to use a somewhat
awkward naming & inheritance construct, so as not to break existing linkcollection instances.
- added a BrowserView (linkcollection-view) for displaying contents of a Linkcollection
- enhanced search mechanism to distinguish between folder and document (thomasw)