Produce a relocatable start script - it sets PYTHONHOME to the

directory where it resides, and expects z2.py to be there.  This way,
the entire installed site can be moved to another directory, and the
start script will continue to do the right thing.  (I don't know what
else has the location coded in - if it all keys off of PYTHONPATH,
then this may be enough...)

inst/make_start.py

@@ -87,17 +87,17 @@ import sys, os
 from do import *
 
 def sh(home, user, group):
-    z2=os.path.join(home, 'z2.py')
     start=os.path.join(home, 'start')
     if not os.path.exists(start):
         print '-'*78
         print 'Creating start script, start'
         open(start,'w').write(
             "#! /bin/sh\n"
-            "PYTHONHOME=%s\n"
+            "reldir=`dirname $0`\n"
+            "PYTHONHOME=`cd $reldir; pwd`\n"
             "export PYTHONHOME\n"
-            'exec %s \\\n  %s \\\n  -D "$@"\n'
-            % (home, sys.executable, z2))
+            'exec %s \\\n     $PYTHONHOME/z2.py \\\n     -D "$@"\n'
+            % sys.executable)
         ch(start,user,group,0711)
 
     stop=os.path.join(home, 'stop')