Rename buffer to generic DataBuffer
Rename buffer to generic DataBuffer

Original git commit by Alexander Larsson <alexl@redhat.com> at 1189431876 +0200

svn path=/trunk/; revision=914

halfline/gvfs,philipl/gvfs,philipl/gvfs,halfline/gvfs,philipl/gvfs,gicmo/gvfs,xkahn/gvfs-cmis,cpatulea/gvfs,xkahn/gvfs-cmis,gicmo/gvfs,gicmo/gvfs,xkahn/gvfs-cmis,gicmo/gvfs,thiblahute/gvfs,halfline/gvfs,cpatulea/gvfs,xkahn/gvfs-cmis,thiblahute/gvfs