Added N^2 node search option back into SerialMesh::stitch_meshes. This option is more robust in the case that we have tolerance issues that lead to less accurate alignment of the nodes that are to be stitched.
Added an extra error checking flag for the case where we expect the number of nodes on the stitched surface IDs to match
Merge pull request #128 from dknez/master

Added N^2 node search option back into SerialMesh::stitch_meshes.