prefer 32 bit platform for ISABELLE_FULL_TEST, to make memory problems more explicit instead of disk thrashing (notably in HOL-Quickcheck_Benchmark);

--- a/Admin/isatest/settings/mac-poly-M4	Thu Nov 29 14:29:29 2012 +0100
+++ b/Admin/isatest/settings/mac-poly-M4	Thu Nov 29 16:52:13 2012 +0100
@@ -27,3 +27,5 @@
 
 ISABELLE_BUILD_OPTIONS="browser_info=false document=false threads=4 parallel_proofs=2"
 
+ISABELLE_FULL_TEST=true
+

--- a/Admin/isatest/settings/mac-poly-M8	Thu Nov 29 14:29:29 2012 +0100
+++ b/Admin/isatest/settings/mac-poly-M8	Thu Nov 29 16:52:13 2012 +0100
@@ -27,3 +27,5 @@
 
 ISABELLE_BUILD_OPTIONS="browser_info=false document=false threads=8 parallel_proofs=2"
 
+ISABELLE_FULL_TEST=true
+

--- a/Admin/isatest/settings/mac-poly64-M4	Thu Nov 29 14:29:29 2012 +0100
+++ b/Admin/isatest/settings/mac-poly64-M4	Thu Nov 29 16:52:13 2012 +0100
@@ -27,5 +27,3 @@
 
 ISABELLE_BUILD_OPTIONS="browser_info=false document=false threads=4 parallel_proofs=2"
 
-ISABELLE_FULL_TEST=true
-

--- a/Admin/isatest/settings/mac-poly64-M8	Thu Nov 29 14:29:29 2012 +0100
+++ b/Admin/isatest/settings/mac-poly64-M8	Thu Nov 29 16:52:13 2012 +0100
@@ -27,5 +27,3 @@
 
 ISABELLE_BUILD_OPTIONS="browser_info=false document=false threads=8 parallel_proofs=2"
 
-ISABELLE_FULL_TEST=true
-