Not done yet, as the overlaps are still not quite right.  This is closer
than the previous version with no overlap calculation though.

A lot of trial and error indicates that the recorded overlap list for
each AOI does not indicate the total number of overlaps to be removed.
Individual overlap values are also sometimes incorrect by a significant
amount.

This takes the approach of averaging high-confidence overlaps to produce
a single value for each of X and Y, which are then applied to all tiles
in the AOI.

The option is false by default; when set to true, each tile in the full
resolution image is returned as a separate series.  Lower resolutions
are then ignored.  This should make it easier to stitch tiles externally
if needed.

Conflicts:
	components/formats-gpl/src/loci/formats/in/VentanaReader.java

Changing the rounding strategy results in smoother stitching,
particularly for resolution levels >= 5.

.bif files may be post-processed to remove overlaps and overlap
metadata.  These files will have the same IFD order and magnification
metadata, but do not need any of the logic to recalculate image sizes
and tile positions.

Conflicts:
	components/formats-gpl/src/loci/formats/in/VentanaReader.java

This should prevent incorrect detection of other TIFF files that have tag 700.

…le openBytes call