install mahout with less pain

$ mkdir mahout
$ cd mahout/
$ svn co http://svn.apache.org/repos/asf/mahout/trunk
$ cd trunk/
$ mvn compile
$ mvn install 
#this will take very long time because of tests
# if you dont want to run tests run mvn -DskipTests clean install
# optionally : 
$ export MAHOUT_LOCAL=TRUE
$ export MAHOUT_HEAPSIZE=1000