Release of SemanticScuttle 0.87

SemanticScuttle is a socialbookmarking tool exploring experimental features.

This new version brings two major features to SemanticScuttle:
1) You can now create a synonym link between tags. For example, by linking the tags "monument" and "monuments", you can find resources tagged with the first one when you navigate through the second one. More important, this link works with the inclusion link already implemented.
2) Users can create commune descriptions for tags and bookmarks. In a small community, the idea is to bring gradually people to work together (if they want it). From a research perspective, we explore the bridge between individual actions (easy to do) and collaborative ones (more difficult but more powerful).

All the changes are there:
* Interface design: allow to access to users' bookmarks from last user sidebox. (Currently, we can just access to their profiles).
* Interface design: hide multiple URLs repeated into history page
* Interface design: hide About link for logged users
* New feature: Collaborative spaces (like wiki) for descriptions of tags and bookmarks
* Interface fix: improve the creation of structured links
* New feature: Allow the creation of synonym links between tags