v6.0-alpha.26

* Improve configurabilty of stroom-proxy.

* Issue **#783** : Reverted code that ignored duplicate selection to fix
double click in tables.

* Issue **#782** : Fix for NPE thrown when using CountGroups when
GroupKey string was null due to non grouped child rows.

* Issue **#778** : Fix for text selection on tooltips etc in the latest
version of Chrome.

* Issue **#776** : Removal of index shard searcher caching to hopefully
fix Lucene directory closing issue.