Adding support for NSE + Ping Scan (-sP) for executing host scripts. So "-sPC", "-sP --script all" and "-sP --script ripeQuery" all work correctly

CHANGELOG

@@ -8,6 +8,8 @@ o Fixed the "resolution errors not showing up" bug. Actually, from now
   stderr is also redirected there (until now, only stdout was
   displayed). [Vladimir]
 
+o NSE now works with the Ping Scan (-sP) to execute host scripts. [Kris]
+
 Nmap 4.68 [2008-6-28]
 
 o Doug integrated all of your version detection submissions and

nmap.cc

@@ -1622,7 +1622,7 @@ int nmap_main(int argc, char *argv[]) {
       if (currenths->flags & HOST_UP && !o.listscan) 
 	o.numhosts_up++;
     
-    if ((o.pingscan && !o.traceroute) || o.listscan) {
+    if ((o.pingscan && !o.traceroute && !o.script) || o.listscan) {
 	/* We're done with the hosts */
 	log_write(LOG_XML, "<host>");
 	write_host_status(currenths, o.resolve_all);

output.cc

@@ -509,6 +509,9 @@ void printportoutput(Target *currenths, PortList *plist) {
 
   vector<const char *> saved_servicefps;
 
+  if (o.pingscan)
+    return;
+
   log_write(LOG_XML, "<ports>");
   int prevstate = PORT_UNKNOWN;
   int istate;