Search improvements
This merge request does two things:
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Move all the search-related code into a new app (it is a big enough feature to not be buried into navigation, and the JS and CSS files where previously in ui/). This implies a migration, no data is lost.
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It is now possible to display tables of experiments using the same analyzer multiple times (with one limitation: all the experiments in the table must use the same toolchain). The limitation on the experiment setup page is removed too.