updated SIS-48, 49, 50 info in CHANGES.txt
updated SIS-48, 49, 50 info in CHANGES.txt

git-svn-id: e77b277088daf562c9c9c2fb19369f0428d13af6@1359757 13f79535-47bb-0310-9956-ffa450edef68

desruisseaux/sis,Geomatys/sis,desruisseaux/sis,Geomatys/sis,desruisseaux/sis,Geomatys/sis,desruisseaux/sis,Geomatys/sis