Close feed item in files view when a channel is loaded.

git-svn-id: http://svn.code.sf.net/p/retroshare/code/trunk@7483 b45a01b8-16f6-495d-af2f-9b41ad6348cc
Added a new setting to channels to enable/disable threaded loading.

git-svn-id: http://svn.code.sf.net/p/retroshare/code/trunk@7484 b45a01b8-16f6-495d-af2f-9b41ad6348cc