counsel.el: Improve counsel-org-goto functions #1008
* Use org-get-heading instead of org-entry-get to get a headline which looks like the one in the buffer (e.g. display of links). * Add variables counsel-org-goto-display-tags and counsel-org-goto-display-todo to control whether tags and todo keywords should be displayed. * Remove 'whole-line from choices of counsel-org-goto-display-style, as the same output can be achieved by setting the two new variables mentioned above.