Bug 2322 - qlogin ne fonctionne pas sur physix

- now sge uses ssh mode for qlogin (it was the case on simpatix too but it wasn't yet scripted). qlogin using ssh works provided the ports are open.

- also set qsh and qrsh to use ssh mode to be consistent. (although not tested yet)

version.py

@@ -24,6 +24,9 @@ class Version(object):
                 return False
         return True
 
+    def __lt__(self, other):
+        return other.__gt__(self)
+
     def __gt__(self, other):
         for i in range(max(len(self.numbers), len(other.numbers))):
             if self.get_number(i) < other.get_number(i):
@@ -33,5 +36,11 @@ class Version(object):
             # if numbers ar equal continue to next version number
         return False  # numbers are equal
 
+    def __ge__(self, other):
+        return self.__gt__(other) or self.__eq__(other)
+
+    def __le__(self, other):
+        return self.__lt__(other) or self.__eq__(other)
+
     def __str__(self):
         return '.'.join([str(n) for n in self.numbers])