Fix error and warnings when building with GCC 4.3

--- src/config.cc
+++ src/config.cc
@@ -61,7 +61,7 @@ int SelectOn = SO_SCN; /* select on scenarios */
 int LogTimeFormat = TF_STRING;
 
 
-char *SO_Names[] = {
+const char* SO_Names[] = {
                     "",
                     "scenario",
                     "sequence"
--- src/config.h
+++ src/config.h
@@ -47,7 +47,7 @@
 #endif
 #endif
 
-extern char *SO_Names[];
+extern const char* SO_Names[];
 
 extern int DNSTTLExpired;
 extern int DNSTimeToLive;
--- src/if.h
+++ src/if.h
@@ -12,6 +12,7 @@
 #ifndef _IF_H
 #define _IF_H
 
+#include <cstring>
 #include <stdio.h>
 #include <errno.h>
 #ifdef __WIN32__
--- src/scenario.cc
+++ src/scenario.cc
@@ -185,7 +185,7 @@ bool Scenario::Restore(const char * nme, FILE * fp)
             next.push_back(strP);
             break;
         case 'T':        /* think time (milliseconds) */
-            if (buf == "_exit") 
+            if (strcmp(buf,"_exit") == 0) 
             {
                 // it's an exiting scenario
                 terminate = true;
--- src/str.cc
+++ src/str.cc
@@ -309,7 +309,7 @@ string topntail(const string& str)
 string lowercase(const string& instr)
 {
     string InStr = instr;
-    transform(InStr.begin(), InStr.end(), InStr.begin(), (int(*)(int))tolower);
+    std::transform(InStr.begin(), InStr.end(), InStr.begin(), (int(*)(int)) tolower);
     return InStr;
 }
 
--- utils/convertLog.cc
+++ utils/convertLog.cc
@@ -12,9 +12,10 @@
 // Purpose: Convert a log file into a set of scenarios
 //
 
+#include <cstdlib>
 #include <time.h>
 #include <stdio.h>
-#include <iostream.h>
+#include <iostream>
 #include <string.h>
 
 #include <sys/types.h>
@@ -69,7 +70,7 @@ printScenario(FILE *outF, const String& ipA, const String& ipR, long thinkT, int
 }
 
 
-main(int argc, char *argv[])
+int main(int argc, char *argv[])
 {
     if (argc != 3)
     {
@@ -263,4 +264,5 @@ main(int argc, char *argv[])
     }
     delete allElements;
     cerr << "\n\n";
+    return 0;
 }
--- utils/strptime.cc
+++ utils/strptime.cc
@@ -404,11 +404,13 @@ strptime_internal (const char * buf, const char * format,
 	      *decided = raw;
 	    }
 #endif
-	  if (!match_string (HERE_AM_STR, rp))
-	    if (match_string (HERE_PM_STR, rp))
-	      is_pm = 1;
-	    else
-	      return NULL;
+	  if (!match_string (HERE_AM_STR, rp)) 
+	    {
+	      if (match_string (HERE_PM_STR, rp))
+	        is_pm = 1;
+	      else
+	        return NULL;
+	    }
 	  break;
 	case 'r':
 #ifdef _NL_CURRENT