mvnprove: support actual tracing while running prove
mvnprove: support actual tracing while running prove

The -d switch has to be used to enable the debugging monitor.
Running with -d has no real performance impact, as long as you don't actually
debug anything.

quattor/maven-tools,quattor/maven-tools,jouvin/maven-tools,jouvin/maven-tools,quattor/maven-tools,jouvin/maven-tools,quattor/maven-tools,jouvin/maven-tools