Fix ops dependency of algorithms-gpl

It used a hardcoded version, and it was in the section of the test
dependencies. This commit fixes both.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Switch to KNIP-specific version

The plan is, of course, to move the KNIP-specific code into ImgLib2's
master where appropriate, or to ImageJ or KNIP, but for the time being
we need to be able to install or deploy the KNIP-specific -SNAPSHOT
version to be able to wrap it into an OSGi bundle.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Merge pull request #62 from imglib/knip-version

Switch 'knip' branch to a KNIP-specific version