avoid a NPE that occures when running JLM compiled with java6 on a java7 JRE
try to not report as successful an exo for which we failed to run any test (eg because we use java6 compiler on java7 JRE)
try to not report as successful an exo for which we failed to run any test (eg because we use java6 compiler on java7 JRE)
display the amount of passed tests when an exercise succeeds
Make sure that jarfiles compiled with Java 6 also work with Java 7
Trying to put things back in order...

Fingers crossed