Added comments on build machines

BrucesNotes.txt

@@ -2,6 +2,11 @@ git clone git@gitlab.aei.uni-hannover.de:einsteinathome/pulsatingscience.git
 
 git checkout -b antenna-patterns origin/antenna-patterns
 
+to do linux builds, use einstein9, which you can reach via atlas5.
+to do mac builds, use denholm, which can be reached via the normal
+AEI network.
+
+
 Mac instructions
 (1) Get the executable from
     www.atlas.aei.uni-hannover.de/~ballen/LSC/GW170817.app.tar