Allow for usage of the checkin-test.py script for TriBITS itself.

This just uses two builds, MPI_DEBUG and SERIAL_RELEASE.  The DEBUG and
RELEASE parts are not very significant but it is important to test with MPI
enabled and disabled.
Simple checkin-test.py wrapper script for Trilinos development.

Some machines might need to set up the locations of the compilers and
therefore might need a machine-specific checkin-test.py wrapper script.

Build/Test Cases Summary
Enabled Packages: TriBITS
Enabled all Forward Packages
0) MPI_DEBUG => passed: passed=135,notpassed=0 (0.57 min)
1) SERIAL_RELEASE => passed: passed=135,notpassed=0 (0.54 min)
Other local commits for this build/test group: 5c2aa1d