deprecate most of cache_status type (use session stats instead)

git-svn-id: http://libtorrent.googlecode.com/svn/trunk@10443 f43f7eb3-cfe1-5f9d-1b5f-e45aa6702bda
transition fenced job histogram to session stats gauges. deprecate it from cache_status

git-svn-id: http://libtorrent.googlecode.com/svn/trunk@10444 f43f7eb3-cfe1-5f9d-1b5f-e45aa6702bda
some more fixes to cache_status

git-svn-id: http://libtorrent.googlecode.com/svn/trunk@10445 f43f7eb3-cfe1-5f9d-1b5f-e45aa6702bda
fix stats_alert with recent changes to stats

git-svn-id: http://libtorrent.googlecode.com/svn/trunk@10446 f43f7eb3-cfe1-5f9d-1b5f-e45aa6702bda