Merge pull request #98 from lovell/master

Ensure -interpolate flag is used with affine transformation
note vipsthumbnail fix
version bump for new cycle
auto-unpack RAD in affine
TODO notes
add some auto unpack stuff

so RAD etc get unpacked automatically
more auto-decode stuff

more to do though
Merge branch 'master' of github.com:jcupitt/libvips

Conflicts:
	TODO
more auto unpack hacking
more jpeg read sanity checking
foreign memory images tagges as ANY

we weren't tagging foreign memory buffers as supporting ANY demand
style, so they were falling back to SMALLTILE

this broke any operation using SEQUENTIAL_UNBUFFERED plus foreign
buffers, eg. falsecolour, since UNBUF needs very strict seq access
falsecolour failed for some image types

type prevented the auto-cast-first-band thing working
support many Radiance readers active at once

we had some globals for the Rad reader state, whcih was fine with the
old reader, but with the new sequential one you can have several active
at once
Merge remote-tracking branch 'origin/7.38'

Conflicts:
	ChangeLog
	configure.ac
	libvips/conversion/falsecolour.c
	libvips/resample/affine.c
better autounpack for falsecolour
more auto-decode
better fits docs
fix stray uses of "layer" in openslideload documentation
drop error freeze/thaw around openslide_open()

openslide_open() hasn't been able to cause a call to vips_error() since
c98d6543.
update for new format support in OpenSlide 3.4.0