Add simple env for serial TriBITS build and dev with SEMS

This allows anyone with access to a SEMS env to do a simple serial (non-MPI)
build of TriBITS.  This avoids some issues with the SEMS env.

dev_testing/sems/load_serial_dev_env.sh

@@ -0,0 +1,9 @@
+# This script can be sourced to load a simple env on any SEMS machine in order
+# to do a basic configuration and testing of TriBITS without MPI.  For some
+# reason the SEMS-built env causes a bunch of TriBITS tests to fail.
+
+module load sems-env
+module load sems-git/2.10.1
+module load atdm-env
+module load atdm-cmake/3.7.0
+module load atdm-ninja_fortran/1.7.2