Adding more tests
Added testing to write mesh collection after mergeContactPoints in mesh; Added a new test to load 2dm file, save as a smtk model (with mesh), then load the smtk file back, and then doing edge split and merge.
Added testing to write mesh collection after mergeContactPoints in mesh; Added a new test to load 2dm file, save as a smtk model (with mesh), then load the smtk file back, and then doing edge split and merge.