Added new unit tests for the newly added pre-checks
- PyARC/test/test_pydassh_input_generation: Modified test_pydassh_input_generation file by adding the new unit tests
- PyARC/test/data: Created input files named dassh_inp_test 11 to 14
- PyARC/PyDASSH: Slightly Modified the error messages for the new pre-checks in PyDASSH