mouseovers in sketch differences

I added mouseovers with brief description of the columns into the Word Sketch and Sketch-Diff pages. The description of the stats and sorting of Sketch-Diff was added into the "Getting Started" wiki page:

"In the "Common Patterns" part, there are four numbers next to each collocate. The first two indicate the frequency of co-occurence with the first and second lemma, the last two show the salience scores for the collocate with both lemmas. All collocates are sorted according to maximum of the two salience scores and coloured according to difference between the scores."

As for full names of the relations - we currently do not have any, the names of the relations are diplayed as they are in WS definition files. But we are considering several ways how to make the WS page more intuitive and we will probably add something like that soon.