release version 1.7.2

+ the test project removes patr-java-profiler-output.data if it exists
+ the java class file transformer now checks for nested classes and
  calls conf.skipOuterClass if necessary
+ the invalid version error message of the importer is improved
+ print a success message when the validate.sh script exits
+ put version information in error message on invalid version import
+ update outdated javadoc location and fix version compare
+ fix make agent-clean