1765: Add private column to views

git-svn-id: svn+ssh://svn.code.sf.net/p/gramps/code/branches/maintenance/gramps40@21159 4ae1f11a-8b86-4847-b8af-ab372f36d1fd
Allow icons as column headings in listviews

git-svn-id: svn+ssh://svn.code.sf.net/p/gramps/code/branches/maintenance/gramps40@21160 4ae1f11a-8b86-4847-b8af-ab372f36d1fd
Tidy up bookmark code

git-svn-id: svn+ssh://svn.code.sf.net/p/gramps/code/branches/maintenance/gramps40@21161 4ae1f11a-8b86-4847-b8af-ab372f36d1fd
Remove handle and tooltip columns from models

git-svn-id: svn+ssh://svn.code.sf.net/p/gramps/code/branches/maintenance/gramps40@21162 4ae1f11a-8b86-4847-b8af-ab372f36d1fd