fix for presenting memory allocation of host and/or vm

Hello

I found the presentation of the memory allocation of host and/or vm
annoying, e.g. hosts/vms with more then one GB showed up in
virtual-manager with x.yy GBwhereas hosts/vms with less or equal to on
GB showed up as xxxx.yy MB. In details of hosts this also showed up.
I changed this behavior to showing GB if memory is >10 GB and set
MB-presentation to 2.0f.
I find it clearer, what is your opinion?

--- a/src/virtManager/domain.py       2009-04-01 23:19:28.000000000 +0200
+++ b/src/virtManager/domain.py       2009-04-02 00:28:44.000000000 +0200
@@ -379,7 +379,7 @@

     def current_memory_pretty(self):
         if self.get_id() == -1:
-            return "0.00 MB"
+            return "0 MB"
         return self.get_memory_pretty()

@@ -400,10 +400,10 @@

     def get_memory_pretty(self):
         mem = self.get_memory()
-        if mem > (1024*1024):
+        if mem > (10*1024*1024):
             return "%2.2f GB" % (mem/(1024.0*1024.0))
         else:
-            return "%2.2f MB" % (mem/1024.0)
+            return "%2.0f MB" % (mem/1024.0)