[gegl] (8 commits) Created branch soc-2011-warp

[Michael Murà <mmure src gnome org>]

The branch 'soc-2011-warp' was created.

Summary of new commits:

  8d73a32... add a buffer-cache op in the workshop
  7105101... configure.ac: add a check for rint, and define HAVE_RINT ac
  a33e6f8... gegl_buffer_dup: implement copy on write
  10b74f0... simplify gegl_buffer_tile_iterator by removing unneeded cod
  2c6eada... gegl_tile_iterator: simplify again and remove a goto
  4349c44... gegl_buffer_dup: use the cache to insert duplicated tiles
  444c4b4... gegl:warp: add code to test copy on write
  5456ab5... implement support for format_n buffer in the nearest neighb