Merge topic 'update-to-v5.6.0-RC1'
54db8446 Update the default version to 5.6.0-RC1 8df4c853 boxlib: Update to get parallel build fix aa9942f2 Update default version to 5.5.2 Acked-by:Kitware Robot <kwrobot@kitware.com> Acked-by:
Ben Boeckel <ben.boeckel@kitware.com> Acked-by:
Utkarsh Ayachit <utkarsh.ayachit@kitware.com> Merge-request: !490