Fix compile error regarding ambiguity between long and int

Remember: the reference Java compiler is Oracle's javac tool. It does not
matter whether code compiles with Eclipse: if code fails to compile with
javac, it is incorrect.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Work around recursive generics issue

This works around compile errors like this one:

	[ERROR] /.../ProcessIndependent.java:[157,7]
	inconvertible types
	found   : T
	required: net.imglib2.type.numeric.real.FloatType

Remember: if code fails to compile with javac, it is incorrect. It does
not matter whether it compiles with Eclipse or not.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>