Aqsis Renderer

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This one is fixed as of 809e878bf2c58bd2d76b2cc6bfcc3671029f8b79.

The artifacts were due to incorrect filtering. There was a bad
interaction between the bucket overlap caching and "rendering" of buckets
which were fully outside of the crop region: The sample region of a bucket
could be reduced in side due to application of a cache from a non-rendered
bucket, and then reduced in size again due to the crop window. This meant
that some samples required for filtering were not present at the top and
left edges of the crop window.

This bugs seems to be something to do with the filtering code: it's only
present when the filter width is exactly an even integer. So if I have a
crop window in conjunction with

PixelFilter "gaussian" 4 4

I see the bug, but with widths of 3.9 3.9 or 4.00001 4.00001 the bug goes
away!

I can confirm this bug with the latest repository version; the artefacts
look oddly like the geometry has been mirrored in the first row of pixels
or something...

It seems is working with current repository version. (Tested in ubuntu)

bug present on the following tested versions:

1.4.2
1.5.0 (current repository version)

using win32 (XP sp2)

1.4.2 installed from binary installer package
1.5.0 downloaded from gsoc respository