Increased heap memory for tests.
Increased heap memory for tests.

The default configuration lead the Jenkins Continuous Integration to
fail in some tests.
sdinot/hipparchus,Hipparchus-Math/hipparchus,Hipparchus-Math/hipparchus,Hipparchus-Math/hipparchus,sdinot/hipparchus,sdinot/hipparchus,sdinot/hipparchus,Hipparchus-Math/hipparchus