John Cupitt ad56c57830 add implementation for VImage::write()
oops, it was missing

also, change the return type from void to VImage. This makes chaining
possible, eg.:

   VImage memory = im.write( Viameg::new_memory() );
2016-06-10 14:22:08 +01:00
..
2015-01-30 21:19:58 +00:00
2016-04-17 10:22:20 +01:00