Fix exordium-rtags-rdm-args handling
Fix exordium-rtags-rdm-args handling

exordium-rtags-rdm-args was not handled correctly for multiple arguments.  This also simplified the code slightly.
psipika/exordium,steve-downey/dot.emacs,pkryger/exordium,philippe-grenet/exordium,fcassirer/dot.emacs