add spec for comments at end of radial lines
reuse rad_blank, save a few bytes (183k to 177k)
remove unnecessary radial newline regex

unreachable from 177k to 173k says Valgrind
rename rad_blank to spaces
accept comment after radial entry comma

still reachable from 173k to 168k
accept comments after radial attribute colon

still reachable from 168k to 162k says Valgrind