update notes

TODO

@@ -1,52 +1,9 @@
 - test new clip stuff?
 
-- test_hist_ismonotonic is failing
-
-	im = Vips.Image.identity()
-	self.assertTrue(im.hist_ismonotonic())
-
-$ more mono.mat 
-2 1 1 128
--1 1
-
-vips identity x.v
-
-vips convi x.v x2.v mono.mat --vips-info --vips-novector
-vips min x2.v
-128.0
-
-vips convi x.v x2.v mono.mat --vips-info
-vips min x2.v
-0.0
-
-  should be 1.0 (0 for first pixel, 1 thereafter), instead it's 0 everywhere
-
-- test_countlines is failing
-
-	im = Vips.Image.black(100, 100)
-	im = im.draw_line(255, 0, 50, 100, 50)
-	n_lines = im.countlines(Vips.Direction.HORIZONTAL)
-	self.assertEqual(n_lines, 1)
-
 - add more webp tests to py suite
 
 - try moving some more of the CLI tests to py
 
-- the gif tests in the suite sometimes fail with giflib5 because of an
-  uninitialized struct in giflib, see
-
-	https://sourceforge.net/p/giflib/bugs/94/
-
-  sadly ubuntu 16.04 only comes with giflib5, and giflib5 is currently broken
-
-- I like the new int mask creator in reducev, can we use it in im_vips2imask()
-  as well?
-
-  not useful, we have control over scale there, for reducev we are aiming for a
-  specific scale (a power of two)
-
-  what about making the int masks for the interpolators?
-
 - try SEQ_UNBUFFERED on jpg source, get out of order error?
 
 - could load pdf thumbnails?