more explicit isatest environment settings (from private .bashrc);

--- a/Admin/isatest/isatest-settings	Fri Mar 30 09:55:03 2012 +0200
+++ b/Admin/isatest/isatest-settings	Fri Mar 30 11:48:24 2012 +0200
@@ -7,6 +7,9 @@
 # source bashrc, we're called by cron
 . ~/.bashrc
 
+export SCALA_HOME="$HOME/lib/scala/current"
+export ISABELLE_JDK_HOME="$HOME/lib/jdk/jdk1.7.0_03"
+
 # canoncical home for all platforms
 HOME=/home/isatest