Initfile for heat example added

examples/init/heat.dat.2d

+heatMesh->macro file name:    ./macro/macro.stand.2d
+heatMesh->global refinements: 4
+heatMesh->min corner: 0 0
+heatMesh->max corner: 1 1
+heatMesh->num cells: 2 2
+heatMesh->dimension: 2 2
+
+heat->mesh:  heatMesh
+heat->names: u
+heat->solver->name: cg
+heat->solver->max iteration:  1000
+heat->solver->absolute tolerance: 1e-6
+heat->solver->break if tolerance not reached: 1
+heat->solver->info: 1
+heat->solver->left precon:    diag
+
+heat->output->filename: heat.2d
+heat->output->output directory: output
+heat->output->ParaView format: 1
+heat->output->ParaView mode: 1
+
+adapt->timestep:    0.1
+adapt->start time:  0.0
+adapt->end time:    1.0