add step8 for user-defined-element(UEL)

Author: yangbai90

examples/tutorial/step8.i

@@ -0,0 +1,53 @@
+[mesh]
+  type=asfem
+  dim=2
+  xmax=5
+  ymax=1
+  nx=100
+  ny=20
+  meshtype=quad9
+[end]
+
+[dofs]
+name=T
+[end]
+
+[elmts]
+  [mythermal]
+    type=user1
+    dofs=T
+    mate=mymate
+  [end]
+[end]
+
+[mates]
+  [mymate]
+    type=user2
+    params=1.0 2.0 0.05 1.0
+    //     rho Cp  K    Q
+  [end]
+[end]
+
+[bcs]
+  [flux]
+    type=neumann
+    dofs=T
+    value=-0.01
+    boundary=right
+  [end]
+[end]
+
+
+[timestepping]
+  type=be
+  dt=1.0e-5
+  dtmax=0.1
+  time=1.0e-1
+  adaptive=true
+  optiters=3
+[end]
+
+[job]
+  type=transient
+  debug=dep
+[end]