added check: low_seqno cannot be greater than high_seqno
added check: low_seqno cannot be greater than high_seqno

deepnarsay/JGroups,rpelisse/JGroups,ibrahimshbat/JGroups,rhusar/JGroups,deepnarsay/JGroups,Sanne/JGroups,danberindei/JGroups,TarantulaTechnology/JGroups,vjuranek/JGroups,rvansa/JGroups,slaskawi/JGroups,TarantulaTechnology/JGroups,danberindei/JGroups,tristantarrant/JGroups,Sanne/JGroups,rvansa/JGroups,dimbleby/JGroups,tristantarrant/JGroups,danberindei/JGroups,vjuranek/JGroups,ligzy/JGroups,ligzy/JGroups,kedzie/JGroups,dimbleby/JGroups,belaban/JGroups,pruivo/JGroups,rhusar/JGroups,slaskawi/JGroups,pferraro/JGroups,kedzie/JGroups,ibrahimshbat/JGroups,rhusar/JGroups,belaban/JGroups,pferraro/JGroups,pferraro/JGroups,ligzy/JGroups,pruivo/JGroups,slaskawi/JGroups,Sanne/JGroups,ibrahimshbat/JGroups,pruivo/JGroups,rpelisse/JGroups,belaban/JGroups,dimbleby/JGroups,rpelisse/JGroups,vjuranek/JGroups,deepnarsay/JGroups,TarantulaTechnology/JGroups,ibrahimshbat/JGroups,kedzie/JGroups