NewRadX: Prevent NewRadX from being applied at symmetry boundaries

[chcheng3]

The loop_outermost_int and loop_outermost_int_device routines used in NewRadX should check for symmetry boundaries. This is so that at symmetry boundaries, the radiative boundary conditions are applied if and only if they are also adjacent to physical boundaries.

This pull request updates NewRadXX with the new loop syntax, so that symmetry information is passed into the loop from the patch data.

Related pull request for Loop: EinsteinToolkit/CarpetX#300

[rhaas80]

Ticket is here https://bitbucket.org/einsteintoolkit/tickets/issues/2820/newradx-boundary-condition-conflicts-with

Needs EinsteinToolkit/CarpetX#300

[chcheng3]

The TestNewRadX test case has been updated so that it applies reflection symmetries, and I have checked that the output has the the correct behavior at symmetry boundaries. The test is now shortened to run only 30 iterations, which evolves the scalar pulse for long enough that any erroneous behavior should be caught in the test.

In response to the reviewer's comments from the corresponding CarpetX PR EinsteinToolkit/CarpetX#300 (comment), I also included CarpetX's driver.hxx by using the USES INCLUDE syntax, instead of hard-coding the path to the header file.