Updated Makefile to build new regression test program and added a header file for the test_mesh file.
Added removal of the reg_tests program to make clean.
Updated test_mesh function to return an int for pass/fail result to be used by the reg_tests driver.
Added the other regression tests to the new test driver.
Removed deprecated test files
Removed deprecated test builds from Makefile
Added run_tests script to the Makefile and updated run_tests to use the new test driver, reg_tests.
Added removal of .h5m test files to make clean.