Implement seek and tell for GLocalFileOutputStream
Implement seek and tell for GLocalFileOutputStream

Original git commit by Alexander Larsson <alexl@redhat.com> at 1188207480 +0200

svn path=/trunk/; revision=804

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