Fixes for gcc 4.7 compilation. Merged from trunk r19313.

AMEGIC++/Main/Single_Process.C

@@ -14,6 +14,8 @@
 #include "ATOOLS/Org/MyStrStream.H"
 #include "ATOOLS/Org/Data_Reader.H"
 
+#include <unistd.h>
+
 using namespace AMEGIC;
 using namespace MODEL;
 using namespace PHASIC;

AMEGIC++/Main/Single_Process_Combined.C

@@ -14,6 +14,8 @@
 #include "ATOOLS/Org/MyStrStream.H"
 #include "ATOOLS/Org/Data_Reader.H"
 
+#include <unistd.h>
+
 using namespace AMEGIC;
 using namespace MODEL;
 using namespace PHASIC;

ATOOLS/Org/Shell_Tools.C

@@ -7,6 +7,7 @@
 #include <errno.h>
 #include <dirent.h>
 #include <cstdlib>
+#include <unistd.h>
 #if __GNUC__
 #include <cxxabi.h>
 #endif

COMIX/Amplitude/Amplitude.C

@@ -160,7 +160,7 @@ Current *Amplitude::CopyCurrent(Current *const c)
   Current_Key ckey(c->Flav(),p_model);
   Current *cur(Current_Getter::GetObject
 	       (std::string(1,m_pmode)+ckey.Type(),ckey));
-  if (cur==NULL) return false;
+  if (cur==NULL) return NULL;
   cur->SetDirection(c->Direction());
   cur->SetCut(c->Cut());
   cur->SetOnShell(c->OnShell());