lalsimulation: mark as version 5.1.0

lalsimulation/configure.ac

 AC_PREREQ([2.63])
-AC_INIT([LALSimulation],[5.0.0.1],[lal-discuss@ligo.org])
+AC_INIT([LALSimulation],[5.1.0],[lal-discuss@ligo.org])
 AC_CONFIG_HEADERS([lib/config.h lib/LALSimulationConfig.h])
 AC_CONFIG_SRCDIR([lib/LALSimulation.c])
 AC_CONFIG_AUX_DIR([gnuscripts])