Update paginator and hits picture when corpus selection is changed

[arildm]

When corpus selection is changed after searching, the current KWIC view is not updated. It is then possible to switch to a page that has no results. And the hits picture shows the old result.

Some ideas on how to handle corpus selection change:

• Automatically perform a new search with the new selection
  • This would become heavy and distracting if the user spends some time selecting and deselecting in the corpus chooser. To prevent that, the new corpus selection should only be stored after closing the chooser.
• Gray the result tabs out until the user clicks Search
  • Related:
    • Hide or fade out current KWIC page while loading the next #80
• Hide the paginator and hits picture until the user clicks Search