small fixups
tiles tiff write needs to cache input

to keep it seq, as it promises to be
better tiled tiff tilecache on write
add the test_thumbnail script too
oops, README dropped from dist
don't strip profiles in XYZ2scRGB

see

https://github.com/lovell/sharp/issues/125
fix profile handling in XYZ2scRGB

see

https://github.com/lovell/sharp/issues/125
Merge branch '7.40'
duuh fix up misplaced patch
Added note for building on OSX from source (from #179)
Merge pull request #195 from homerjam/patch-1

Added note for building on OSX from source (from #179)
update build from git notes
add .szi as a synonym for .zip

in dzsave
improve vipsthumbnail with broken images

if there was an incorrect embedded profile, no fallback import profile,
and an export profile, vipsthumbnail could crash

see https://github.com/jcupitt/libvips/issues/186
tiny fixes
don't make the .pc libs list ourselves

see https://github.com/jcupitt/libvips/issues/196

thanks bgilbert
add Libs.private to help static link with mingw

see https://github.com/jcupitt/libvips/issues/196
fix nip2 build on win

we have to statically link on win if we are using cfitsio ... make sure
-ljpeg gets into the link line, it doesn't have a .pc

https://github.com/jcupitt/libvips/issues/196
more .pc changes

see https://github.com/jcupitt/libvips/issues/196
remove -pthread from libs

we should get it from cflags, I think