Syntax corrections/cleanups

	modified:   pyfr/solvers/euler/inters.py
	modified:   pyfr/solvers/euler/kernels/bcs/char-riem-inv.mako
	modified:   pyfr/solvers/euler/kernels/bcs/slp-adia-wall.mako
	modified:   pyfr/solvers/navstokes/inters.py
	modified:   pyfr/solvers/navstokes/kernels/bcs/char-riem-inv.mako