the default build into a single file.

images of a different size while any kind of zoom was in effect
it could cause a segmentation fault.

jump to the beginning.

routines more robust.

first image.

the XSLT stylesheet file is always created in the same directory as the
main XML metadata file.

object.

thread_pool.  Previously, each separation oracle call was dispatched
to a thread individually.  This is inefficient when there are a whole
lot of samples (and thus separation oracle calls which need to be made).
So now entire batches of separation oracle calls are dispatched to
each thread.  This minimizes the thread switching and synchronization
overhead.

this component will be caught by the unit tests.