Fix broken link
POM: bump to pom-imagej 2.35
Bump to latest parent pom

Increased the pom-imagej version to 2.38
Migrate to ConvertService

Major parts of the ConversionUtils class are now deprecated. Updated to
use the ConvertService instead.
Bump to next development cycle

Signed-off-by: Mark Hiner <hinerm@gmail.com>
POM: remove superfluous groupId declaration
MeanRealType: add javadoc
MeanRealType: handle null output

I am not confident that this method of handling things is correct, or
best, but we should do _something_ when the output is null, because
function outputs are marked with required=false. So we need to create
one on the fly with some default when no explicit output is given.
Add a unit test for Mean
MeanRealType: do not hardcode DoubleType for sum
MeanRealType: add hack for javac compiler support
Bump to next development cycle

Signed-off-by: Curtis Rueden <ctrueden@wisc.edu>