XLALGenerateSimBurst(): add support for Cherenkov bursts
XLALGenerateSimBurst(): wrapper function directing sim_burst XML rows to the appropriate lalsimuation function; add support for XLALSimBurstCherenkovRadiation().
XLALGenerateSimBurst(): wrapper function directing sim_burst XML rows to the appropriate lalsimuation function; add support for XLALSimBurstCherenkovRadiation().