in getReconnectIntervalSecs(), raise the interval between reconnection attempts if the peer was previously unreachable

git-svn-id: svn://svn.transmissionbt.com/Transmission/trunk@13801 f4695dd4-2c0a-0410-b89c-da849a56a58e
reduce the default peer counts: global goes from 240 to 200, per-torrent goes from 60 down to 50

git-svn-id: svn://svn.transmissionbt.com/Transmission/trunk@13802 f4695dd4-2c0a-0410-b89c-da849a56a58e