New function imformats. * imformats.m: the new function. * __magick_read__.cc: created new internal function __magick__formats__ to be used by imformats(). * NEWS: add imformats to list of new functions. * image.txi: add reference to new function to the Octave manual. * module.mk: include new function in the build system.

--- a/scripts/image/module.mk	Fri Jul 05 07:12:18 2013 -0400
+++ b/scripts/image/module.mk	Thu Jul 04 18:35:11 2013 +0100
@@ -25,6 +25,7 @@
   image/image.m \
   image/imagesc.m \
   image/imfinfo.m \
+  image/imformats.m \
   image/imread.m \
   image/imshow.m \
   image/imwrite.m \