From Lorenzo:

add plugin for MathMore numerical integration


git-svn-id: http://root.cern.ch/svn/root/trunk@20329 27541ba8-7e3a-0410-8455-c3a389f83636

etc/plugins/ROOT@@Math@@VirtualIntegrator/P010_GSLIntegrator.C

+void P010_GSLIntegrator()
+{
+   gPluginMgr->AddHandler("ROOT::Math::VirtualIntegrator", "GSLIntegrator", "ROOT::Math::GSLIntegrator",
+      "GSLIntegrator", "GSLIntegrator(const char *, double, double, unsigned int)");
+}

etc/plugins/ROOT@@Math@@VirtualIntegrator/P020_GSLMCIntegrator.C

+void P020_GSLMCIntegrator()
+{
+   gPluginMgr->AddHandler("ROOT::Math::VirtualIntegrator", "GSLMCIntegrator", "ROOT::Math::GSLMCIntegrator",
+      "GSLMCIntegrator", "GSLMCIntegrator(const char *, double, double, unsigned int)");
+}