Format xml files

...n/basics-advection-diffusion/completed/ADR_conditions.xml

...on/basics-advection-diffusion/tutorial/ADR_conditions.xml

.../helmholtz/basics-helmholtz/completed/Helm_conditions.xml

...erSubsonic_NS/completed/1000steps/CylinderSubsonic_NS.xml

...nderSubsonic_NS/completed/Time0.6/CylinderSubsonic_NS.xml

.../cfs-CylinderSubsonic_NS/tutorial/CylinderSubsonic_NS.xml

events/2008/Canada-CFD/TutorialExercises/QuadMesh.xml

events/2011/Cambridge-AIM/Channel/Base/Channel-Base.xml

events/2011/Cambridge-AIM/Channel/Geometry/Channel.xml

.../2011/Cambridge-AIM/Channel/Stability/Channel_Coupled.xml

events/2011/Cambridge-AIM/Channel/Stability/Channel_VCS.xml

events/2011/Cambridge-AIM/Cylinder/Base/Cylinder-Base.xml

...ridge-AIM/Cylinder/Stability/Adjoint/Cylinder_Adjoint.xml

...mbridge-AIM/Cylinder/Stability/Direct/Cylinder_Direct.xml

...ge-AIM/Cylinder/Stability/Receptivity/Cylinder_Direct.xml

...bridge-AIM/NekTutorial (def)/Channel/Geometry/Channel.xml

...dge-AIM/NekTutorial (def)/Cylinder/Base/Cylinder-Base.xml

...ial (def)/Cylinder/Stability/Adjoint/Cylinder_Adjoint.xml

...orial (def)/Cylinder/Stability/Direct/Cylinder_Direct.xml

...mbridge-AIM/NekTutorial-def/Channel/Base/Channel-Base.xml